Sri Lanka, May 13 -- Iran's chief negotiator said Tuesday (May 12) that Washington must accept Tehran's latest peace plan or face failure, after US President Donald Trump warned the truce in the Middle East war was on the brink of collapse.

The war, which erupted more than two months ago with US-Israeli strikes on Iran, has spread throughout the Middle East and roiled the global economy despite the ceasefire, impacting hundreds of millions worldwide.

Both sides have refused to make concessions and repeatedly threatened to resume fighting, but neither appears willing to return to all-out war.

"There is no alternative but to accept the rights of the Iranian people as laid out in the 14-point proposal. Any other approach will be completel...