According to the White House, US President Joe Biden has warned that there is a “distinct possibility” that Russia will invade Ukraine next month.
Meanwhile, Russia says there is “little reason for optimism” in resolving the crisis after the US rejected Russia’s main demands.
Tens of thousands of Russian troops have been stationed along Ukraine’s borders in recent weeks, fueling fears of an invasion.
Russia denies any plans for an attack.
The remarks were made by President Trump during a phone call with Ukrainian President Volodymyr Zelensky on Thursday.
“President Biden stated that there is a strong possibility that Russia will invade Ukraine in February,” said White House National Security Council spokesperson Emily Horne.
“He has publicly stated this, and we have been warning about it for months.”
President Biden “reaffirmed the readiness of the United States, along with its allies and partners, to respond decisively if Russia continues to invade Ukraine,” according to a White House statement.
According to Mr. Zelensky, they “discussed recent diplomatic efforts on de-escalation and agreed on future joint actions.”
According to Axios, citing unnamed sources, the two disagreed on the severity of the threat.
According to some military experts, Russia may be waiting for the ground in Ukraine to freeze so that heavy equipment can be moved in.
Another crucial phone call will take place on Friday when French President Emmanuel Macron speaks with Russian President Vladimir Putin.
It would not be the first time that Russia invaded Ukraine.
In 2014, Russia annexed Ukraine’s southern Crimean peninsula.
It also backs rebels who quickly seized large swaths of the eastern Donbas region, where 14,000 people have died in the fighting.