That seems to be a minority opinion here. I generally agree. Ukraine is a kleptocracy, and it will quickly become the USA's fight and money being sunk into a black hole. The Chechyns gave the Russians something to worry about for years with IED's, snipers, etc... If anyone Ukraine truly wishes to defend their country - there are many ways to do it.
Checheniya has rugged country to hide in. Ukraine is flat as Kansas. Attack helos will find and kill any who resist the new Russian Empire. Poland faces a Fourth Partition if they wait for NATO to defend them.
It’s kinda hard with two burgeoning empires on either side of it.