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Inevitable or not, Putin & Russia are responsible for this.
Why the USA haven't intervene like in Yougoslavia, Irak, Syria, Afghanistan, Lybia if they really pretend to be an ally of Ukraine ? 
Why would only Russia be allowed to attack with his allies and not Ukraine ?
If Biden had said that he would intervene in case of a russian attack never would have Putin dare invade. And for this I recognise Trump was true in his says that he wouldn't have allowed Russia to enter Ukraine. >

If you started studying the history of Russia and Ukraine just when Ukraine tried getting independence till now,you would understand that there is nothing anyone on earth could have done to stop Russia from attacking Ukraine. This was going to happen today or 10 years from now. Putin would given up the whole entire Russian population just for him not to see Ukraine became west.