Russian Foreign Minister Sergei Lavrov, when asked about Western accusations that Moscow is conducting a hybrid war against European countries, said on Tuesday that it was Europe that was at war with Russia.

"I have no doubt that this is a war Europe is waging against us," Lavrov told reporters, citing Europe's supply of weapons to Ukraine.

Meanwhile, a US official said on Tuesday that Russian President Vladimir Putin's envoy Kirill Dmitriev held "constructive" talks Monday with the US about ending the Ukraine war, including possible US-Russia energy initiatives in the postwar period.

This is a developing story.