India, May 30 -- Listing his sweeping demands as part of a proposed peace deal, US President Donald Trump said he was heading into a Situation Room meeting to make a "final determination" on Iran, even as contradictory statements from Tehran raised fresh doubts over whether the two sides were actually nearing a breakthrough or headed toward yet another false alarm after months of stop-start negotiations.

The war, which began on February 28 following joint US-Israeli strikes on Tehran, has now dragged on for nearly three months. While a temporary ceasefire agreed on April 8 remains in place, sporadic military action has continued. A report by US media outlet Axios said negotiators from both sides had reached a preliminary understanding on...