Putin has become predictable, dropping the threat to go nuclear whenever the war HE STARTED escalates.
Fighting together, Europe, the Nato nations and the U.S. would crush Russia overnight and Putin would likely be deposed by his own people. China would vanish from his side immediately, Unfortunately, it is a long shot that the military would ignore/defy him and refuse to go nuclear.
Biden has no clue of how to tamp the conflict down. Neither does Harris. Trump is over-confident that he has the magic words to talk Putin down. Thanks to the current administration, there may not be a solution that does not include the death of many many innocent persons.