US President Joe Biden on Friday said he was preparing fresh policies to halt any Russian plans to invade Ukraine after Washington and Kiev reported Moscow had massed troops near its border.

Tensions have skyrocketed in recent weeks after US Secretary of State Antony Blinken warned Moscow against an invasion. 

Kiev said Russia has deployed around 115,000 troops near its borders, on Moscow-annexed Crimea and in two eastern regions held by pro-Russian rebels.

The Kremlin denied the allegations and accused the United States of stoking tensions.

"What I am doing is putting together what I believe will be the most comprehensive and meaningful set of initiatives to make it very, very difficult for Mr. Putin to go ahead and do what people are worried he may do," Biden told reporters on Friday.

The Kremlin said Friday a video call would take place next week between Russian President Vladimir Putin and Biden.

Kremlin foreign policy adviser Yuri Ushakov told reporters a date had been agreed but would not be announced until final details of the talks have also been set.

Despite increased contacts between the two rivals since Putin and Biden met for the first time at a summit in Geneva in June, tensions have remained high.

As well as the Ukraine conflict, Russia and the United States continue to argue over cyberattacks and the staffing of their embassies, after several waves of diplomatic expulsions.