Iran has officially supported Russia’s invasion of Ukraine, but new complications in talks to revive the 2015 nuclear deal signal differences between Moscow and Tehran.

Iran’s new negotiating team signaled few compromises as it resumed talks over freezing its nuclear program amid reports of new uranium enrichment efforts.

Iran welcomes the departure of U.S. forces from its eastern neighbor but could have concerns about the potential reemergence of Sunni-Shia tensions with the Taliban back in power.

Ebrahim Raisi, a staunch regime loyalist, can be expected to follow through on talks to revive the nuclear deal but rebuff attempts to further limit Iran’s weapons programs and regional behavior.

Washington and Tehran seem determined to revive the deal that freezes Iran’s nuclear program, despite domestic criticism on both sides and the apparent sabotage of an Iranian facility.