May 25 (Reuters) - The U.S. and Iran are discussing a plan to open the Strait of Hormuz about 30 days after the two countries reach a deal to end hostilities, the Nikkei newspaper reported on Monday citing a Middle East diplomatic source.Iran would proceed to clear mines from the strait during a 30-day window following an agreement, after which ships from all countries would be able to navigate freely and safely, and Iran would stop collecting transit fees, Nikkei said.

A fragile ceasefire has been in place since April 8, punctuated by skirmishes as the U.S. and Iran jockey over the Strait of Hormuz.

The Iranian authorities have also proposed "discussing the issue of sanctions and frozen assets before signing any agreement

The US and Iran are close to signing a 60-day ceasefire agreement that would reopen the Strait of Hormuz, allow Iran to freely export oil, and begin negotiations on curbing…