KRAUTHAMMER: The answer is what is so obvious, you immediately fly in major supplies of light weaponry and defensive weaponry — anti-tank, anti-aircraft — so you begin to arm the Ukrainians, so when Putin make a calculation, he understands there will never be any NATO troops in Ukraine to oppose him. But now he has to think that there is this unrest and there is some resistance in the east. It will be armed resistance. That is so obvious, it’s almost unspeakably obvious.

The second is to reassure the neighbors, and you don’t do it with a trip here and there by a Biden or a Secretary of Defense. What you do is you forward deploy NATO troops into places like the Baltics or into Poland. We had an understanding at the end of the Cold War we wouldn’t do that because that would provoke the Russians.

The response is to say you broke the understanding of the end of the Cold War, and now we’re going to have NATO troops on your frontier. That’s a way to send a message that means something and is not just hot air.

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