If a Warsaw Pact country bordered Canada or the US, we would have no choice.
But Putin isn't invading the Ukraine because of NATO, he's invade Ukraine to stop the "westernization" of the Ukraine. If the Russian people get wind of how much better life was in the Ukraine before the invasion, they'd want the same things in Russia.
As it is, Russian soldiers are looting Ukrainians homes and sending the TV's, laptops, and other high end consumer goods back to Russia.
Putin and his oligarchs have been stealing billions from the Russian people who don't have all of the modern conveniences of western society.