Iran: Hormuz Strait Closed Again, Peace Talks Deadlocked
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Iran: Hormuz Strait Closed Again, Peace Talks Deadlocked

By Le Pivot — Iran Monitor · April 18, 2026 · 10 min read

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Fifty-one days into the most serious regional conflict in decades, Iran and the United States remain locked in a dangerous impasse. Tehran re-closed the Strait of Hormuz on Friday, April 18, citing the US naval blockade imposed on April 13 as a “violation of the ceasefire.” Meanwhile, Pakistan-mediated peace talks have stalled on the nuclear question, and Iran’s economy continues its freefall.

Strait of Hormuz Closed Again

On April 18, the Islamic Revolutionary Guard Corps (IRGC) officially reinstated the closure of the Strait of Hormuz — the chokepoint through which roughly 20% of global oil flows. The decision came five days after the United States imposed a naval blockade on Iranian ports, a move Tehran calls a breach of the April 7-8 ceasefire agreement.

April 19 has already brought escalation: IRGC fast boats opened fire on a commercial tanker in the Persian Gulf, damaging containers aboard a container ship, according to UK Maritime Trade Operations (UKMTO). Since the US blockade was imposed, 23 commercial vessels have been forced to turn back by American naval forces.

The strait closure threatens Iranian oil revenues — estimated at around $5 billion per month during the truce — while also putting pressure on global energy markets already destabilized by the conflict.

Islamabad Talks: Nuclear Deadlock

The first round of direct US-Iran negotiations, held April 11-12 in Islamabad under Pakistani mediation, ended in failure after 21 hours of talks. Positions remain irreconcilable:

  • US side: full dismantlement of Iran’s nuclear program and surrender of approximately 450 kg of highly enriched uranium.
  • Iranian side: firm guarantees that bombing will not resume once concessions are granted — a security demand Washington refuses to formalize.

Iranian Parliament Speaker Mohammad Qalibaf summarized the outcome: “The Americans failed to win the trust of the Iranian delegation.”

Since then, Egypt and Turkey have joined mediation efforts. Pakistani military chief Asim Munir traveled to Tehran on April 14-15 with new American proposals. On April 19, Tehran signaled “progress” in evaluating these proposals but stated that a final agreement remains “far off.” A second round of talks is reportedly being prepared.

On the US domestic front, the House of Representatives rejected on April 16 a resolution that would have limited President Trump’s war powers against Iran, consolidating the executive’s position.

Economy Under Maximum Pressure

Iranian economic indicators continue deteriorating at an alarming pace:

  • 40% inflation since the start of the conflict in late February, according to economic data reviewed by Fortune.
  • Rial collapse: authorities are openly concerned about their ability to meet civil servant payrolls.
  • Tightened sanctions: on April 15, the US Treasury’s OFAC sanctioned more than two dozen individuals, companies, and vessels linked to the oil-trafficking network of Mohammad Hossein Shamkhani. Washington also refused to renew sanctions waivers that had allowed India and other countries to import Iranian oil.
  • $100 billion in Iranian assets remain frozen abroad — a central issue in the negotiations.

Oil represented approximately 25% of Iranian government revenues in 2023; the double shock of the naval blockade and tightened sanctions further undermines the regime’s public finances.

Internal Crackdown: Executions and Mass Arrests

Since March 19, the regime has carried out at least 13 politically motivated executions: six members of the People’s Mojahedin (PMOI/MEK) and seven protesters, charged with espionage or attempted overthrow of the regime. Checkpoints have been massively deployed across major cities, with security forces inspecting mobile phones. Internet shutdowns continue.

According to NGOs, between 2,700 and 4,000 people have been detained since the conflict began — a figure that is likely an undercount. On April 17, however, PMOI “Resistance Units” resumed anti-regime activities in Zahedan in southeastern Iran, defying the post-execution crackdown.

The protest movement, which began on December 28, 2025 and has spread to more than 200 cities, is considered by analysts to be the largest popular uprising since the 1979 Islamic Revolution.

Key Takeaways

1. The Strait of Hormuz is once again the primary pressure lever. Iran’s reimposition of the closure is a direct response to the US naval blockade — both sides are testing the ceasefire’s limits.

2. Negotiations are progressing, but slowly. Tehran speaks of “progress,” but the gap between US demands (full nuclear dismantlement) and Iranian security guarantees remains enormous.

3. Iran’s economy is in structural crisis. With 40% inflation, a collapsed rial, and tightened sanctions, the regime faces economic pressures that directly influence its diplomatic calculations.

4. Internal repression is intensifying. Mass executions and arrests signal a regime that fears its own citizens as much as external pressure.

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