A planned trip by Vice President JD Vance to Pakistan for further U.S.-Iran peace talks has been delayed after Iran did not respond to the latest American negotiating positions.

The postponement comes amid rising tensions tied to the ongoing U.S.-Israeli conflict with Iran and concerns that diplomacy is stalling.

Iranian officials said talks could still happen if U.S. pressure and threats ease, while disputes continue over issues like naval restrictions near the Strait of Hormuz.

The delay follows an earlier round of talks in Islamabad that ended without an agreement after 21 hours of negotiations, CNBC has reported.

Despite setbacks, U.S. officials, including President Donald Trump, have expressed cautious optimism about reaching a deal.