Russian Foreign Minister Sergei Lavrov has discussed reviving Iran's nuclear deal with U.S. Secretary of State Antony Blinken, Russia's foreign ministry said on Wednesday.
Lavrov is set to meet his Iranian counterpart Hossein Amirabdollahian later in the day.
U.S. National Security Advisor Jake Sullivan said on Tuesday that if diplomacy with Iran should fail, the U.S. is "prepared to turn to other options" to ensure Tehran never develops a nuclear weapon, the White House said Tuesday following a meeting between Israeli and U.S. national security advisors.
On Sunday, Iran's foreign minister said that U.S. officials tried to discuss restarting nuclear talks last month, but he insisted Washington must first release $10 billion of Tehran's frozen funds as a sign of good will.
Iran has rejected direct talks with the United States, and indirect talks on reviving a 2015 nuclear accord aimed at keeping Iran from being able to develop a nuclear weapon stopped in June.
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Amirabdollahian reiterated that Iran would "soon" return to the stalled nuclear talks in Vienna, declining to give a date.
Tehran says its nuclear steps are reversible if Washington lifts all sanctions. Iranian and Western officials have said many issues remain to be resolved before the accord can be revived.