The United States Navy has begun a blockade of the Strait of Hormuz, President Trump announced, following the collapse of ceasefire talks with Iran. The announcement marks a significant escalation in tensions between Washington and Tehran, with Trump stating that negotiations had failed and that military pressure would now be applied to the critical shipping waterway through which roughly one-fifth of the world's oil supply passes.

Trump accompanied the blockade announcement with renewed threats to strike Iranian infrastructure, including power plants and bridges, if Iran did not comply with U.S. demands regarding its nuclear program. The administration has characterized Iran's refusal to curtail its nuclear ambitions as the primary obstacle to any diplomatic resolution.

U.S. Central Command confirmed the blockade operation is underway, with naval assets positioned to enforce restrictions on traffic through the strait. According to Fox News, Trump also expressed frustration with NATO over the crisis, and reported that the Iranian Navy had been destroyed in preceding engagements. The full scope of prior military exchanges has not been independently confirmed across all outlets.

Oil prices surged in response to the news of the blockade, with markets reacting to the potential disruption of crude shipments through one of the world's most strategically vital chokepoints. CNBC reported significant price volatility beginning on April 12 as the breakdown in talks became apparent and the prospect of a blockade grew more concrete.

The diplomatic breakdown comes after rounds of negotiations that had been described as ceasefire-focused, involving discussions related to Lebanon and broader regional stability. Iran's refusal to alter its nuclear posture has been cited by U.S. officials as the central sticking point. The situation continues to develop rapidly, with international observers and allied governments monitoring the potential impact on global energy supplies and regional security.