At least two people were killed in a drone attack in Russia’s southwestern Saratov region and parts of Ukraine went without power following targeted assaults on energy infrastructure, local authorities said Saturday, as U.S.-led peace talks on ending the war press on.

The claim comes as Russia steps up its use of the Geran-3, a turbojet-powered loitering munition modeled after Iran’s Shahed-238. Ukraine’s General Staff said in a recent briefing that Russia has already launched 138 of the new drones in recent weeks.

Ukrainian President Volodymyr Zelenskyy on Sunday voiced readiness to drop his country's bid to join NATO in exchange for Western security guarantees, but rejected the U.S. push for ceding territory to Russia as he held talks with U.