Leading US politicians should be added to a "list of war criminals" as they are now directly participating in "hostilities" in Ukraine, the Chairman of Russia's State Duma, Vyacheslav Volodin, claimed on Saturday, citing media reports about alleged intelligence-sharing with Ukraine.

US President Joe Biden has told senior intelligence officials that "counterproductive" leaks about data sharing with Ukraine should stop, NBC reported on Friday.

Although there was no official reaction to the report from the US authorities, Volodin took to Telegram to comment on it. "The United States is taking part in hostilities in Ukraine. US President Biden, demanding to stop leaks about the exchange of intelligence information with Ukraine, admitted that Washington had been exposed," he wrote.

Volodin said that the Ukrainian government, which he described as the "Kiev Nazi regime," not only relies on weapons from the West, but also on the "assistance of American intelligence forces."

The Duma chairman wrote that Washington "essentially coordinates and develops military operations" in Ukraine, and is therefore directly participating in the "hostilities" against Russian forces.