Russia's Defense Ministry, meanwhile, said its forces downed at least 66 Ukrainian drones overnight into Tuesday morning. Among the areas targeted was the southwestern Voronezh region which borders northeastern Ukraine. At least 16 people were injured there, Gov. Aleksandr Gusev said on Telegram.

MOSCOW (Reuters) -Russia does not care about U.S. President Donald Trump's "theatrical ultimatum" about slapping sanctions on buyers of Russian exports unless Moscow agrees to a peace deal in Ukraine, a senior security official said on Tuesday.

Trump also revealed that Putin had recently offered to assist in mediating between Israel and Iran during their brief June conflict — an offer he declined. “I said, ‘No, no, you help me get a settlement with you, with Russia,’” Trump recounted. “And I think we're going to be doing that too.”