The United States imposed a naval blockade on Iranian ports and coastal waters on Monday, escalating tensions in the Gulf region following a breakdown in peace talks between Washington and Tehran. This blockade, which took effect April 13 at 10 a.m. Eastern Time, aims to curb maritime traffic to and from Iranian ports while keeping the Strait of Hormuz open for neutral shipping, according to advisories issued by the United Kingdom Maritime Trade Operations, a Royal Navy-run entity responsible for maritime coordination in the area.

President Donald Trump issued a stern warning that any Iranian vessels approaching the blockade would be destroyed, likening the enforcement to U.S. actions against drug traffickers at sea. “If any of these ships come anywhere close to our BLOCKADE, they will be immediately ELIMINATED,” Trump stated on social media. The U.S. military has bolstered its presence in the region with over 15 warships, including an aircraft carrier, guided-missile destroyers, and an amphibious assault ship, according to U.S. officials.

Iranian authorities condemned the blockade as an act of piracy, with military spokesperson Ebrahim Zolfaghari asserting that any threat to Iran’s ports would destabilize security across the Persian Gulf and Gulf of Oman. Iran’s navy, although diminished by recent U.S. operations, retains a fleet of smaller, agile vessels capable of posing risks to commercial shipping. Iranian officials also criticized the ongoing U.S. sanctions and military pressure as maximalist tactics that hinder prospects for peace.

The blockade follows the collapse of the first U.S.-Iran peace talks in 47 years, held in Islamabad, Pakistan, over the weekend. Despite more than 20 hours of negotiation, no agreement was reached on key issues including Iran’s uranium stockpile, enrichment activities, and support for regional allies. U.S. officials confirmed that Iran rejected demands to halt nuclear enrichment and regional funding, positions carried over from previous negotiations abandoned by the Trump administration shortly before the conflict escalated.

In parallel with the naval blockade, the United States has reportedly softened its initial demand for Iran to cease uranium enrichment indefinitely, proposing a 20-year freeze instead. A U.S. official characterized ongoing diplomatic engagement as showing “forward motion,” though President Trump expressed ambivalence about whether Iran would return to the dialogue, stating, “I don’t care if they come back or not.”

The developments have triggered a surge in global oil prices, with Brent crude rising above $100 per barrel and U.S. gasoline prices averaging $4.12 per gallon—up from pre-conflict levels near $3. The Strait of Hormuz remains a critical maritime chokepoint, accounting for roughly one-fifth of the world’s oil trade. NATO allies, including Britain and France, have declined to participate directly in the blockade, emphasizing the importance of maintaining uninterrupted shipping and announcing initiatives to ensure safe passage in the region once hostilities subside.

Israeli Prime Minister Benjamin Netanyahu expressed support for the U.S. blockade and confirmed ongoing military operations against Hezbollah in Lebanon, a group backed by Iran. Israeli and Lebanese officials are scheduled to meet soon for peace talks aimed at reinforcing a fragile ceasefire that has seen renewed hostilities in recent days.

Amid the escalating conflict, Pope Leo publicly rejected President Trump’s criticism of his stance on the war and immigration, affirming his commitment to speaking out on humanitarian and moral issues. The pope condemned recent threats against Iran, calling such rhetoric “unacceptable” and urging reflection on U.S. policies toward migrants.

The blockade and heightened military presence risk deepening tensions in a strategically vital region, while diplomatic efforts to resolve the broader conflict remain uncertain.