Last I checked we are a member of NATO… which is mostly in Europe. As a member of NATO security in Europe is our concern. As of now, Europe is providing at least as much, if not more, for Ukraine (as they should). Right now, both Europe and the US can get away with checking Russia with weapons and money. Should Ukraine fall, what do you think happens next? Do you think Russia stops there when Putin is already saying the same sorts of things about the Baltics as he did about Ukraine? Heck, now he’s even claiming the sale of AK was illegal and that its still Russian territory because of that. Should we ignore those things? Stop Russia now, on the cheap really, and we won’t have to find out.