Based on the provided source material, here is the text of the Iran Update Special Report, June 19, 2026, produced by the Institute for the Study of War (ISW) and the Critical Threats Project (CTP).
Iran Update Special Report, June 19, 2026
Data Cutoff: 2:00 PM ET.
Key Takeaways
- Nuclear Leverage: Iran is attempting to condition US-Iran nuclear negotiations on the United States compelling Israel to halt operations against Hezbollah in Lebanon. Tying these issues together helps Iran preserve Hezbollah, delay nuclear negotiations, and reap economic benefits from the existing US-Iran memorandum of understanding (MoU).
- Delaying Concessions: Iran likely seeks to postpone negotiations to avoid making concessions on its nuclear program while still benefiting from the MoU's economic relief. Iranian officials have shown no willingness to concede on key issues, such as their highly enriched uranium stockpile and domestic enrichment capabilities.
- Ceasefire Demands: Although Israel and Hezbollah agreed to a ceasefire on June 19, it likely does not meet Iran’s demand for a “complete ceasefire,” which Iranian officials define as requiring the total withdrawal of Israeli forces from Lebanese territory.
- Strait of Hormuz: Iran is reopening the Strait of Hormuz in a way that retains Iranian control rather than restoring the pre-war status quo. Some regime elements argue the strait should remain closed to extract further concessions, such as an Israeli withdrawal from Lebanon.
- New Iraqi Militia Cells: The IRGC has formed multiple Iraqi militia cells that report directly to the IRGC rather than pre-existing proxies. These cells have conducted attacks on Gulf countries hosting US forces to deflect responsibility from established militias amid US pressure on the Iraqi government to disarm them. These cells may also be part of an effort to build a new, more loyal and ideological cadre.
Toplines
Iran’s Strategic Linkage of Nuclear Talks and Lebanon Iran is attempting to force the United States to pressure Israel into ending operations against Hezbollah by conditioning nuclear negotiations on the Lebanon issue. This strategy allows the regime to preserve Hezbollah—a key pillar of its deterrence—while delaying nuclear talks to avoid concessions and continue receiving economic benefits from the June 17 MoU.
Iranian officials canceled planned technical nuclear talks in Switzerland on June 19, claiming that recent Israeli strikes in Lebanon violated the MoU. The IDF had struck over 80 Hezbollah targets between June 18 and 19 following a Hezbollah attack that killed four Israeli soldiers. Iran interprets the MoU’s call for a ceasefire on all fronts as requiring Israel to cease operations and withdraw from Lebanese territory.
Deputy Foreign Affairs Minister Saeed Khatib Zadeh stated that the US must ensure Israel "abides" by the MoU and that Iran will not proceed to the 60-day negotiation phase until the US halts Israeli operations. Other officials, including Foreign Minister Abbas Araghchi, have echoed this, holding the US responsible for any violations of the MoU. Meanwhile, Iran is benefiting from the US lifting the blockade on Iranian ports and issuing oil export sanctions waivers. A senior US official warned that the process could stop within weeks if Iran is not serious about nuclear concessions.
Status of the Lebanon Ceasefire While a ceasefire was agreed upon on June 19, it likely fails to meet Iran's requirement for a "complete" ceasefire involving an Israeli withdrawal. Israeli officials have confirmed they will end "offensive operations" but will remain positioned in southern Lebanon to respond to future Hezbollah attacks. Iran continues to insist that a withdrawal is a precondition for nuclear talks.
Maritime Activity in the Strait of Hormuz
Iran is reopening the Strait of Hormuz in a manner that asserts its control over maritime traffic. The Supreme National Security Council (SNSC) and the Persian Gulf Strait Authority (PGSA) now require commercial vessels to submit transit requests, use assigned routes through Iranian territorial waters, and comply with Iranian safety and insurance requirements.
The PGSA is waiving certain service fees during the 60-day negotiation period but intends to resume charging them afterward. While Western maritime organizations have warned vessels to avoid the international traffic scheme due to mines, Iran’s new scheme passes directly through its territorial waters. Reports indicate Iranian forces have already turned back some vessels, requiring them to obtain exit permits. This system gives Iran significant leverage over global commerce. Some IRGC-affiliated media have even called for the total closure of the strait until Israel withdraws from Lebanon.
Iraqi Militia Cells and Regional Pressure
The IRGC has reportedly created new, elite Iraqi militia cells that report directly to Tehran rather than existing militia structures. These cells, containing roughly 10 fighters each, launched at least seven drone attacks against Kuwait, the UAE, and Saudi Arabia between April 20 and May 17. While the UAE and Saudi Arabia intercepted the attacks, the cells successfully targeted Kuwait’s Ali al Salem Airbase and international airport.
This shift in tactics is designed to provide Iran with plausible deniability and protect established proxies from US pressure on the Iraqi government to disarm them. The US has conditioned economic support for Iraq on the disarmament of these groups. Additionally, these cells represent a more "ideologically hardened" and tightly controlled cadre of fighters loyal to Iran.
Iranian Domestic Affairs
An unspecified senior Iranian military official highlighted the effectiveness of using ballistic missiles equipped with cluster munition warheads during the recent conflict. The official argued these weapons can "saturate" and sustain pressure on US and Israeli air defense systems. Iran likely used cluster munitions because they are harder to intercept and cause extensive area damage, compensating for an inability to destroy discrete military targets with standard missiles.
Axis of Resistance Activity
An Iraqi Ministry of Defense official indicated that weapons received as part of the federal government’s disarmament efforts could potentially be supplied to the Iranian-backed Popular Mobilization Forces (PMF). While the Iraqi Prime Minister has offered 35,000 security jobs to militia members who disarm, many PMF groups continue to follow Iranian direction rather than the Iraqi state.
US and Israeli Air Campaign: Nothing significant to report.
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