Biden believes Russian troops could cross border
The US believes Russia is behind so-called "false flag attacks" to "discredit the Ukrainians", and give Moscow reason to invade.
Moscow's claims about troops withdrawing from the border are being disputed by NATO and other western nations.
The latest diplomatic attempt to avoid that will see the American President speak to other world leaders, later.
Joe Biden believes troops could cross the border within days:
US Secretary of State Antony Blinken issued this warning to the UN Security Council:

US Military Fire On Ship In Gulf Of Oman
Over 250 People Now Confirmed Dead Following Devastating Earthquake In Colombia
Rescue Operation Continues After 160 Dead In Colombian Earthquake
Six Killed In School Shooting Near Bangkok In Thailand
Reports Of Iran And Oman Working Towards Deal To Reopen Strait Of Hormuz
EU Home Affairs Ministers Meet To Discuss Protection Of Borders From Illegal Migration
Donald Trump Says "Board of Peace" Has Reached An Agreement For Disarment Of Hamas
Daniel Kinahan Set To Face Trial In Ireland