If Trump was our present Potus, he would step aside to allow his master Putin to invade Ukraine. Instead NATO is cohesive in defending Ukraine. Ukraine is a democracy that NATO would support.
Putin thought the time was ripe to reclaim Ukraine. He was counting on American internal skirmish to take the focus off Ukraine.
With lunar new year and winter Olympics don't expect president Xi to come to his aide presently..as Xi is focus on utilizing Olympics to showcase China as a world leader.
Putin might of overplayed his hand. Biden is resolved not a pushover. He can walk and chew gum at the same time.