Yet we've never bothered Canada or Mexico for being involved with Cuba. They're sovereign countries and unless we're going to be as bad as Russia we need to trust them to make their own decisions and we need to respect their sovereignty as we expect them to respect ours.
It’s still not the same. There’s a significant portion of the Ukrainian population that’s ethnically Russian. Far more so than Poland, the Czech Republic, or the Balkans, Russia sees Ukraine as being almost a part of Russia. They will not take such action lightly. Military intervention is almost a certainty in this instance.
Oh really? Mexico respects US sovereignty? Where the hell have you been lately?