Iran Update Special Report, May 19, 2026

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Iran Update Special Report, May 19, 2026

The Institute for the Study of War (ISW) and The Critical Threats Project (CTP) at the American Enterprise Institute are publishing daily updates to provide analysis on the war with Iran. The updates focus on US and Israeli strikes on Iran and Iran and the Axis of Resistance’s response to the strikes. The updates cover events from the past 24-hour period. 

Key Takeaways

The United States continues to pressure Iran economically through its naval blockade and sanctions, which impose costs on Iran’s economy.

Concerns from Iranian officials or citizens about economic damage do not, on their own, imply that Iranian leaders will drop negotiating demands. Other factors, such as (but not limited to) a proven threat to regime stability, could trigger a rethink among Iranian leaders about their negotiating positions. Iranian leaders have proven that they care little for the economic well-being of the Iranian people beyond the impact the economic well-being of the people has on regime stability.

Some North Atlantic Treaty Organization (NATO) countries reportedly support a plan to escort ships through the Strait of Hormuz beginning in early July if Iran continues to impose its blockade, according to a senior NATO official speaking to Bloomberg on May 19. One NATO diplomat stated that several NATO countries support the idea, but that there is not the required unanimous support to enact it.

Iran reportedly analyzed US military aircraft flight patterns to try to improve its ability to intercept and target US and allied aircraft during the war. The New York Times, citing a US military official, reported that Iranian military commanders studied the flight patterns of US fighter jets and bombers, likely ahead of and throughout the recent war. The US official is aware of the risk of predictable flight patterns, which means that the US military is aware of and could diagnose the issue of predictability during the ceasefire.

Toplines

The United States continues to pressure Iran economically through its naval blockade and sanctions, which impose costs on Iran’s economy. The blockade is especially affecting oil exports. It does not follow, however, that these economic damages alone will compel Iran to accept US negotiating demands. US Central Command (CENTCOM) reported redirecting 88 commercial vessels and disabling four as part of the blockade of Iranian ports.[1] Iran has expanded its oil storage by reusing 10 aging tankers to hold oil, according to United Against Nuclear Iran and Financial Times.[2] These tankers are now clustered around Kharg Island and Chabahar Port. This indicates that Iran is experiencing challenges in storing the oil it produces because aging tankers are suboptimal for holding oil.[3]

It is not clear how much Iran could expand its oil storage capacity at this time. Iran has continually expanded its storage facilities since the conflict began, though some of the storage facilities will become increasingly suboptimal. There is presumably a point at which Iran will run out of even minimally effective storage assets, like aging tankers it can reactivate, but it is not clear at what point this will occur from open-source reporting. Maritime intelligence firm Kpler estimated that Iran has stored 42 million crude oil barrels on Iranian tankers in the Middle East, a 65 percent increase since the conflict began, and has roughly 24 million barrels of additional floating storage on empty tankers within the US blockade area.[4] Energy intelligence firm Kayrros assessed that Iran’s onshore storage has also risen by about 10 million barrels to 64 percent capacity, leaving only a few weeks’ worth of oil production space.[5] The US Treasury Department has separately intensified economic pressure on Iran on May 19 by sanctioning the Amin Exchange and associated front companies tied to hundreds of millions in oil-related transactions, blocking 19 vessels linked to illicit Iranian oil exports, and urging global partners to enforce sanctions more strictly.[6]

These economic restrictions are increasingly evident in Iran, as Iranian officials express ongoing concern about the economy, and reports highlight growing frustration among citizens. President Masoud Pezeshkian called for long-term planning to mitigate war-related economic impacts on May 19, while officials warned of rising drug prices potentially fueling public discontent.[7] Anti-Iranian regime media reports detailed gasoline shortages and at least one localized worker protest over wages in Zanjan City in northwestern Iran on May 19.[8]

Restrictions and concerns from Iranian officials or citizens do not, on their own, imply that Iranian leaders will drop negotiating demands. Other factors, such as (but not limited to) a proven threat to regime stability, could trigger a rethink among Iranian leaders about their negotiating positions. Iranian leaders have proven that they care little for the economic well-being of the Iranian people beyond the impact the economic well-being of the people has on regime stability.

Some North Atlantic Treaty Organization (NATO) countries reportedly support a plan to escort ships through the Strait of Hormuz beginning in early July if Iran continues to impose its blockade, according to a senior NATO official speaking to Bloomberg on May 19.[9] One NATO diplomat stated that several NATO countries support the idea, but that there is not the required unanimous support to enact it. The diplomat added that some NATO countries are still reluctant to get involved in the conflict, but that NATO is generally concerned about the economic consequences of keeping the strait closed.

Iran reportedly analyzed US military aircraft flight patterns to try to improve its ability to intercept and target US and allied aircraft during the war. The New York Times, citing a US military official, reported that Iranian military commanders studied the flight patterns of US fighter jets and bombers, likely ahead of and throughout the recent war.[10] The official suggested that the downing of a US F-15E and an A-10 on April 3, and the damage suffered to an F-35 on March 19, indicated that US flight patterns had become too predictable.[11] The official added that Russia may have supported this effort as part of a broader Russian effort to help Iran target US and allied assets during the war.[12] Russia also provided Iran with satellite imagery of US bases and modified Shahed drones during the conflict.[13]

The US official is aware of the risk of predictable flight patterns, which means that the US military is aware of and could diagnose the issue of predictability during the ceasefire. A shootdown of an aircraft would presumably trigger an after-action review. A close study of flight patterns can nonetheless enable Iranian forces to “ambush” aircraft flying in a predictable manner when combined with other tactics and technological tools. Serbian forces shot down a US Air Force F-117 Nighthawk in 1999, for example, by studying the predictable ingress and egress routes of US aircraft as they evaded Serbian air defenses.[14] Serbian forces combined this knowledge with low-band radars to successfully shoot down the F-117. [15]

Maritime Developments

See topline section.

US and Israeli Air Campaign

Nothing significant to report.

US-Iran Negotiations

The US and Iranian negotiating positions remain inconsistent with each other. Reuters, citing two Iranian officials, reported on May 18 that the United States agreed to release 25 percent of frozen Iranian assets under an unspecified timetable.[16] Iran reportedly sought a complete release of these funds instead. Iran also sought a halt to uranium enrichment for a period shorter than the 20-year pause that the US side has demanded.[17] Iran also proposed diluting some of its highly enriched uranium (HEU) and sending the rest to Russia, while maintaining the right to ”reclaim it” if the United States violates the agreement.[18] The US demand has been and continues to be that Iran must hand over its HEU to the United States and dismantle Iran’s nuclear facilities.[19]

Lebanese Hezbollah and the Israeli Campaign in Lebanon

Hezbollah’s current military operations are likely designed to demoralize the Israel Defense Forces (IDF) soldiers and disrupt IDF freedom of movement in Lebanon. Hezbollah, in recent days, has conducted attacks using improvised explosive devices (IED), first-person view (FPV) and fixed-wing drones, rockets, and mortar fire to disrupt IDF movement and demoralize IDF personnel.[20] Hezbollah resumed complex ambushes using IEDs to target IDF forces along the Qouzah axis in central southern Lebanon and the Taybeh-Qantara axis in southeastern Lebanon on May 13.[21] These axes are operationally significant for the IDF and serve as key logistics corridors for ground forces in southern Lebanon, which are crucial for Israeli forces’ freedom of movement.[22] Hezbollah’s recent IED attacks are a continuation of the group’s broader effort to disrupt Israeli operations by using harassing fire, which is fire that is intended to disrupt enemy troop and vehicle movement, disturb their rest, and lower their morale.[23] Hezbollah has historically employed harassing fire to disrupt Israeli ground lines of communications and demoralize IDF forces to degrade military effectiveness and heighten psychological distress.[24] FPV attacks and IED ambushes result in a constant risk of attack and generate anxiety, which can weaken force morale and place soldiers under immense psychological stress.[25] Hezbollah’s attacks have remained relatively limited, with the group conducting an average of about 11 attacks per day since the start of the ceasefire on April 16.[26]

Israeli media reports indicate that FPV attacks, while not causing significant damage or huge numbers of casualties, are forcing the IDF to change the way it operates. It is unclear the degree to which these IDF changes are affecting the ability of Israeli forces to accomplish their missions, but it is clear that the attacks are affecting the Israeli will to execute those missions under certain conditions. Israel’s public broadcaster reported that Hezbollah FPV drones have affected between 70 and 80 percent of Israeli forces’ freedom of movement in southern Lebanon by restricting most units to nighttime movement and operations.[27] It is not clear what precisely the Israeli broadcaster means by ”freedom of movement” and how the 70 to 80 percent number is calculated.[28] Israeli units have expanded IDF operational control over territory in southern Lebanon since the start of the temporary ceasefire in spite of the challenges posed by FPV drones.[29]

Hezbollah likely uses the footage of its attacks published by its official media channels as a tool to degrade IDF morale. Hezbollah’s official media channels routinely publish footage of Hezbollah’s attacks, particularly FPV drone footage.[30] Hezbollah likely publishes this footage to demonstrate the group’s drone capabilities and its ability to circumvent Israeli countermeasures and increase IDF soldiers’ stress of a possible attack.[31] Hezbollah footage has repeatedly shown the group’s drone operators striking Israeli Merkava tanks despite the presence of anti-drone cages.[32] Hezbollah footage of the attack targeting IDF personnel demonstrates danger to individual soldiers, especially as FPV drones have caused the majority of IDF deaths since the beginning of the temporary ceasefire on April 16.[33] Hezbollah officials, including LH Secretary General Naim Qassem, have stated that Hezbollah’s objective is to maximize Israeli casualties in southern Lebanon, which is also likely stated to try to diminish IDF morale.[34]

Hezbollah also likely intends to instill fear in Israeli civilians and degrade Israeli political will by depicting the group’s attacks as unpreventable, easy to sustain, and reactive to Israeli military action. Hezbollah leaders have long viewed the Israeli public as a target audience with influence over Israeli leaders’ will, and the group likely uses attack footage to scare and demoralize Israeli civilians as well as IDF personnel.[35] Recent Hezbollah attacks have targeted valuable and symbolic Israeli military assets, in particular Iron Dome air defense batteries, using inexpensive FPV drones to inflict costly damage in Israeli territory.[36] These attacks could have more significant military effects if scaled up, of course. A Hezbollah-aligned journalist said on May 19 that Hezbollah FPV drone attacks on Iron Dome batteries in northern Israel demonstrate Hezbollah fighters‘ skill and reach in targeting an Israeli military “source of pride.”[37] The journalist emphasized that Hezbollah FPV drones have struck targets more than two kilometers over the Israel-Lebanon border, likely intending to show the Israeli public that attacks can extend further than border-area targets.[38] Hezbollah’s media messaging is likely meant to convince Israeli civilians that Hezbollah will continue to threaten and impose costs on northern Israel until Israeli political leaders cease military operations in Lebanon and concede to Hezbollah’s demands. Hezbollah frequently names Israeli military activity in Lebanon as its justification for attacks on northern Israel, and Qassem has consistently demanded a full halt to IDF operations, Israel’s total withdrawal from Lebanon, and other terms as non-negotiable.[39] This effort likely intends to generate widespread insecurity in northern Israel that would compel civilians to pressure political leaders into submitting to Hezbollah’s terms.

Other Axis of Resistance Activity

Likely Iranian-backed Iraqi militias launched six drones targeting the United Arab Emirates (UAE) from May 17 to 19.[40] The Emirati Defense Ministry announced on May 19 that it intercepted six drones that originated from Iraq targeting “civilian and vital areas” in the country over the past 48 hours.[41] This appears to include the May 17 drone attack on the Barakah Nuclear Power Plant, which the UAE confirmed originated from Iraq. This report comes after the Saudi Defense Ministry stated on May 17 that it intercepted three drones launched from Iraq that entered Saudi airspace.[42]

IRGC-affiliated media used the most recent drone attacks on the UAE to drive a wedge between Israel and the UAE by blaming Israel for the attack.[43] IRGC-affiliated media claimed on May 19 that Israel conducted the drone attack and warned the Emirati government that its relationship with Israel would undermine the UAE’s security and economy.[44] This is likely in response to growing cooperation between Israel and the UAE.[45] IRGC-affiliated media previously accused Saudi Arabia of attacking the UAE.[46]

Iranian-backed Iraqi militias are reportedly using surveillance drones to observe Saudi Arabia and Kuwait, according to four Iraqi security sources and one informed person speaking to Western media on May 13.[47] The sources added that the militias are sharing the intelligence with Iran.[48] Iranian-backed Iraqi militias have used FPV drones to perform reconnaissance tasks during the war.[49] ISW-CTP assessed on May 11 that Iran is likely providing Iraqi militias with FPV drone technology.[50]

Endnotes

[1] https://x.com/CENTCOM/status/2056715103240618332

[2] https://www.ft.com/content/0f556bb8-3370-4405-8969-bae8b20d816e?syn-25a6b1a6=1

[3] https://www.ft.com/content/0f556bb8-3370-4405-8969-bae8b20d816e?syn-25a6b1a6=1

[4] https://www.ft.com/content/0f556bb8-3370-4405-8969-bae8b20d816e?syn-25a6b1a6=1

[5] https://www.ft.com/content/0f556bb8-3370-4405-8969-bae8b20d816e?syn-25a6b1a6=1

[6] https://home.treasury.gov/news/press-releases/sb0502; https://www.nytimes.com/2026/05/18/business/g7-finance-ministers-meeting-iran-war-oil.html

[7] https://t.me/iribnews/339923; https://x.com/ilnanews/status/2056736821858513059?s=20; https://t.me/iribnews/339932

[8] https://x.com/IranIntl/status/2056706440921031003?s=20; https://x.com/IranIntl/status/2056736635568500843?s=20 ; https://x.com/IranIntl/status/2056680468871823423?s=20

[9] https://www.bloomberg.com/news/articles/2026-05-19/nato-is-starting-to-consider-hormuz-deployment-to-protect-ships

[10] https://www.nytimes.com/2026/05/18/us/politics/trump-iran-strikes.html

[11] https://www.wsj.com/world/middle-east/iran-uses-asymmetric-warfare-to-inflict-pain-from-a-weakened-position-c054df77 ; https://www.cnn.com/2026/03/19/politics/f-35-damage-iran-war

[12] https://www.nytimes.com/2026/05/18/us/politics/trump-iran-strikes.html

[13] https://www.wsj.com/world/russia-is-sharing-satellite-imagery-and-drone-technology-with-iran-0dd95e49?gaa_at=eafs&gaa_n=AWEtsqdClj4yvnV2UdoEsMav9OYOipXtj2zhjxrcwpXAtj_Fnj2cCpRr_t4r&gaa_ts=69c45087&gaa_sig=1HARg9mxzVN48vD353Kwp_WsowKSy8K5hk-p0YMGmnoMT1oM3Hl2XHAHccCwhLK107oTTfkw6JQAW8X7upr8DQ%3D%3D ; https://www.cnn.com/2026/03/15/world/video/gps-0315-zelensky-on-iran-drones

[14] https://nationalinterest.org/blog/reboot/f-117-stealth-fighter-how-symbol-us-air-power-was-shot-down-209642

[15] https://nationalinterest.org/blog/reboot/f-117-stealth-fighter-how-symbol-us-air-power-was-shot-down-209642

[16] https://www.reuters.com/world/middle-east/no-deal-no-exit-how-us-iran-standoff-risks-fresh-conflict-2026-05-18/

[17] https://www.reuters.com/world/middle-east/no-deal-no-exit-how-us-iran-standoff-risks-fresh-conflict-2026-05-18/

[18] https://www.reuters.com/world/middle-east/no-deal-no-exit-how-us-iran-standoff-risks-fresh-conflict-2026-05-18/

[19] https://www.bbc.com/news/articles/cgkpnnen5dzo

[20] https://t.me/mmirleb/16143 ; https://t.me/mmirleb/16181 ; https://t.me/mmirleb/16278 ; https://t.me/mmirleb/16341

[21] https://t.me/mmirleb/16296 ; https://t.me/mmirleb/16276 ; https://t.me/mmirleb/16276 ; https://t.me/mmirleb/16268 ; https://t.me/mmirleb/16184 ; https://t.me/mmirleb/16183 ; https://t.me/mmirleb/16115 ;

[22] https://understandingwar.org/research/middle-east/iran-update-special-report-may-6-2026/

[23] https://understandingwar.org/research/middle-east/iran-update-special-report-may-6-2026/ ; https://jitc.fhu.disa.mil/jitc_dri/pdfs/jp1_02.pdf ; https://www.benning.army.mil/Infantry/DoctrineSupplement/ATP3-21.8/appendix_c/IndirectFirePlanning/TacticalUsesofPlannedIndirectFires/index.html

[24] https://www.armyupress.army.mil/Portals/7/combat-studies-institute/csi-books/we-were-caught-unprepared.pdf , p.7-8.

[25] https://www.bbc.com/news/articles/c1j2zwe9g5no

[26] https://t.me/mmirleb/16143 ; https://t.me/mmirleb/16181 ; https://t.me/mmirleb/16278 ; https://t.me/mmirleb/16341 ; https://t.me/mmirleb/16308 ; https://www.state.gov/releases/office-of-the-spokesperson/2026/04/ten-day-cessation-of-hostilities-to-enable-peace-negotiations-between-israel-and-lebanon/

[27] https://www.kan dot org.il/content/kan-news/defense/1042606/

[28] https://www.kan dot org.il/content/kan-news/defense/1042606/

[29] https://x.com/manniefabian/status/2054116724371308824 ; https://www.idf dot il/340752 ; https://www.i24news dot tv/en/news/israel/defense/artc-idf-crosses-litani-river-and-reaches-one-of-deepest-points-in-southern-lebanon

[30] https://t.me/mmirleb/16319 ; https://t.me/mmirleb/16312 ; https://t.me/mmirleb/16301 ; https://t.me/mmirleb/16196 ; https://t.me/mmirleb/16261 ; https://t.me/mmirleb/16202

[31] https://t.me/mmirleb/16312 ; https://t.me/mmirleb/16319 ; https://t.me/mmirleb/16251 ; https://t.me/mmirleb/16256 ; https://t.me/mmirleb/16330 ;

[32] https://t.me/mmirleb/15878 ; https://t.me/mmirleb/16312 ; https://t.me/mmirleb/15728 ; https://www.popularmechanics.com/military/weapons/a45561784/israel-cope-cage-armor/

[33] https://t.me/moriahdoron/30896 ; https://www.bbc.com/news/articles/c1j2zwe9g5no

[34] https://t.me/mmirleb/15712

[35] https://www.armyupress.army.mil/Portals/7/combat-studies-institute/csi-books/we-were-caught-unprepared.pdf ; https://t.me/mmirleb/16293 ; https://t.me/mmirleb/15959

[36] https://t.me/mmirleb/15959 ; https://t.me/mmirleb/16323 ; https://t.me/mmirleb/16354 ; https://t.me/mmirleb/16357

[37] https://t.me/sameralhajali/2853

[38] https://t.me/sameralhajali/2853

[39] https://t.me/mmirleb/15876 ; https://t.me/mmirleb/15844 ; https://t.me/mmirleb/16315 ; https://t.me/mmirleb/15588 ; https://t.me/mmirleb/16047

[40] https://x.com/modgovae/status/2056750382194528552

[41] https://x.com/modgovae/status/2056750382194528552

[42] https://understandingwar.org/research/middle-east/iran-update-special-report-may-18-2026/ ; https://x.com/modgovksa/status/2056102093358854204

[43] https://www.tasnimnews dot ir/fa/news/1405/02/29/3595177/

[44] https://www.tasnimnews dot ir/fa/news/1405/02/29/3595177/

[45] https://understandingwar.org/research/middle-east/iran-update-special-report-may-17-2026/ ; https://www.reuters.com/world/middle-east/us-envoy-says-israel-sent-iron-dome-battery-personnel-uae-2026-05-12/

[46] https://understandingwar.org/research/middle-east/iran-update-special-report-may-17-2026/

[47] https://www.reuters.com/world/middle-east/saudi-warplanes-struck-militias-iraq-during-war-sources-say-2026-05-13/

[48] https://www.reuters.com/world/middle-east/saudi-warplanes-struck-militias-iraq-during-war-sources-say-2026-05-13/

[49] https://t.me/awlialdm/287

[50] https://understandingwar.org/research/middle-east/iran-update-special-report-may-11-2026/

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