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What's at stake is not simply, as important as it is, Ukraine's territorial integrity, sovereignty, independence but very basic principles that have, in a hard-fought way after two World Wars and a Cold War, undergirded security, peace and prosperity for countries around the world -- principles like one country can't simply change the borders of another by force ; principles like one country can't simply dictate to another its choices, its policies, with who it will associate ; principles like one country can't exert a sphere of influence to subjugate its neighbors to its will, if we allow those principles to be challenged with impunity, even if it's half a world away in Europe, that will have an impact here as well.