President Joe Biden said that Russia would make a "serious mistake" if it deploys tactical nuclear weapons in Ukraine.

Earlier, Russia stated that Kiev intended to use a dirty bomb on the ground in Ukraine. Western countries rejected the claim, suggesting that Russia wants to use it as a pretext to escalate the war in Ukraine.

"I spent a lot of time today talking about that," Biden said when asked about Russia's intentions.

"Let me just say Russia would be making incredibly serious mistake if it were to use a tactical nuclear weapon,” he went on. “I’m not guaranteeing that it’s a false flag operation yet. We don’t know. It would be a serious, serious mistake.”