According to Biden, he spoke about this to Russian President Vladimir Putin.

“If any organized Russian units cross the border into Ukraine, it will be an invasion,” TASS quoted him as saying.

The American president said that if this happens, the United States and allies will give a "tough and coordinated economic response."

He also claims that in this case, Russia "will pay a high price."

Earlier, Ukrainian President Volodymyr Zelensky criticized Biden's words about the US reaction in the event of a possible "minor aggression" of Russia against Ukraine.

Russian Foreign Minister Sergei Lavrov, in a telephone conversation with US Secretary of State Anthony Blinken, urged him not to replicate speculation about the allegedly impending "Russian aggression", but to force the Ukrainian authorities to implement the Minsk agreements in full.

In December, the President of Russia, at talks with his American counterpart, said that Russian troops were deployed on the territory of the country and did not threaten anyone.

Prior to this, the press secretary of the Russian leader, Dmitry Peskov, said that Russia was not going to attack anyone.