The administrations of US President Donald Trump and the Iranian government confirmed on Friday the existence of a preliminary agreement aimed at extending the current ceasefire by sixty days and opening formal talks on Iran's nuclear program, in what amounts to the most significant diplomatic advance since the start of the war three months ago. However, the versions disseminated by Washington and Tehran on the content of the understanding differ substantially on the central points: the reopening of the Strait of Hormuz, the fate of the highly enriched uranium under Iranian control, and the possible payment of frozen funds to the Islamic Republic.

The deal would extend the ceasefire for 60 days.

The United States and Iran have reportedly reached a tentative agreement on a 60-day memorandum of understanding aimed at extending the current ceasefire and reopening…