US State Department spokesperson responds to Russian Embassy tweet, calls it a “flat out lie.”

Medvedev's threats follow claims by Russia's Foreign Intelligence Service (SVR) that Paris and London are working to provide Ukraine with nuclear arms to "secure more favorable terms" in negotiations.

Moscow has previously cited alleged Ukrainian sabotage or attacks as grounds for escalating tensions.

Russian officials, propagandists, and some Western intelligence assessments initially predicted that Ukraine could fall within days or weeks.

The case comes amid Ukrainian efforts to restrict Russian access to Starlink satellite communications.

"Here I spoke with President Biden, and it was right here that I heard: Volodymyr, there is a threat. You need to leave Ukraine urgently," President Volodymyr Zelensky said.

Russia launched 133 drones and an Iskander-M ballistic missile at Ukraine overnight, the Air Force said.

"We demand Budapest stop dragging Ukraine into Hungary's domestic politics," Foreign Minister Andrii Sybiha said.

The visits coincide with gatherings of the Coalition of the Willing and the Ukraine–Nordic–Baltic summit.

The number includes 920 casualties that Russian forces suffered over the past day.

President Volodymyr Zelensky said on Feb. 23 in an interview with Belarusian independent outlet Dzerkalo that Russia has deployed Shahed drone repeaters in Belarus to help coordinate attacks on Ukraine.