First let those states and the European states fight Russia. Right now they want us to do all the heavy lifting while they don't bother. If they don't care, we sure shouldn't. I DO NOT CARE what country of Europe Putin takes over IF Europe doesn't bother to fight.
Reminds me of the Hitler crisis: 1935 he rearmed the Rhineland. 1936 started (illegal) conscription and rearming. 1936 started major fighting in support of Franco in Spain. 1938 Anschluss with Austria. Taking over the Sudetenland. 1939 Taking over Czechoslovakia. Invading Poland. 1940: nobody was STILL fighting Germany, so Hitler took over Norway and Denmark. May 10: took over France in ten days and they STILL didn't fight! And Britain boogied for home at Dunkirk and hoped for the best.
Smartest thing we could ever do is stay right out of military incompetence on such a high order as that. That's what is going on now with Ukraine: Europe simply does not care. They want the Russian oil, and they just don't care, and simply hope Putin won't go further.
Let them fight if they care to. If they don't, the heck with them. That is their continent and they are responsible, not us.