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.

Trump said the United States would put secondary tariffs on countries that do business with Russia if a peace deal is not reached in 50 days.

US President Donald Trump has announced the US will send "top-of-the-line weapons" to Ukraine via Nato countries, while also threatening Russia with severe tariffs if a deal to end the war is not reached within 50 days.