Many of us have said for years that terrorists have attacked us asymmetrically, where we are weakest. We've also said that they only have to be right once, whereas we have be right 100 percent of the time.
Well, apply that to Ukraine. Putin found Ukraine’s weakest point and exploited it. Russia inserted a trained covert force in Crimea quickly against Ukraine’s small military force and ineffective government. The Russians were strong, the Ukrainians were weak.
The response of the West should be to use our own comparative strength against Russia’s weakness. We have a strong economy and a robust energy future. Their economy is riddled with corruption and depends on Russia being a gas station to Europe and elsewhere.