US Secretary of State Antony Blinken said reviving the accord "would be the best result for America's security", but that if diplomacy fails, "US and allies are looking at other steps, other options".
Iranian Foreign Minister Hossein Amirabdollahian said Tehran wants negotiations to focus on removing economic sanctions and selling Iranian oil easily.
Iran's nuclear chief says the UN nuclear watchdog's demand for access to the Karaj workshop is beyond "safeguards" and unacceptable to Tehran.
EU foreign policy chief says he hopes the Iranian and EU diplomats will have preparatory meetings in Brussels in the days to come to revive nuclear talks.
The talks, aimed at bringing Iran and the United States back into compliance with the nuclear deal, will pick up again next week based on the progress achieved so far, diplomats say.
While 60 percent enrichment is higher than any level Iran previously enriched uranium, it is still lower than weapons-grade levels of 90 percent. The 2015 nuclear deal limited Iran’s enrichment to 3.67 percent.
Mohsen Fakhrizadeh was killed in an attack in Absard, a small city east of Tehran, reports say, while Foreign Minister Javad Zarif claims "serious indications" of Israel's role in assassination.
Britain, France, Germany, China and Russia are struggling to save the landmark 2015 accord with Iran, which has been progressively stepping up its nuclear activities since the US pulled out of the deal in 2018.
Iran's supreme leader has responded by ruling out negotiations with the US over Tehran's ballistic missile and nuclear programmes and urging Iranians to resist pressure.
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