And when they are actually threatened we will join in their defense because of the foreign entanglement called nato. Jumping in based on some world domination theory is foolish
If the European powers aren't concerned enough to jump in why should the US be?
Poland and Estonia have both been 'closely monitoring an uptick in Russian agents and subversive anti-government pro-Russian movements'. this isn't a limited thing, Ukraine is just the first, even though Georgia and Chechnya might have been the true first examples.
Supplying weapons to Ukraine will only exacerbate an already volatile situation. The situation on the ground will remain little changed, since Russia will have no choice but to step up its weapon deliveries to the separatists in response. No, just no.. Find another way to feed the military industrial complex.