US President Donald Trump has publicly declared Iran’s response to a US peace proposal “totally unacceptable,” further stalling diplomatic negotiations aimed at ending the ongoing conflict. Neither the specifics of the American proposal nor the details of Iran’s response have been publicly disclosed.

Meanwhile, the Strait of Hormuz remains effectively shut, severely disrupting global energy shipping routes. The strategic waterway handles approximately one-fifth of the world’s oil supply, and its prolonged closure is sending shockwaves through international energy markets.

Trump has previously ordered the US military to develop plans to strike Iranian defenses along the Strait of Hormuz. With diplomatic talks stalled, the prospect of military action is growing. US Central Command has increased its military presence in the region to protect American naval vessels.

CNBC reports that US stock futures have slid on the latest developments in Iran war negotiations, with investors concerned about the uncertainty. The diplomatic impasse casts a shadow over the global economic outlook.

Trump had previously told Congress that the ceasefire made authorization for war against Iran unnecessary. But Iran’s firm response challenges that position. The international community is calling on both sides to show restraint and prevent further escalation.

Analysts suggest the key variable is whether both sides are willing to compromise on their core disagreements. Freedom of navigation in the Strait of Hormuz and Iran’s nuclear program remain the main obstacles to a deal.