WALTER RUSSELL MEAD: Putin Invades Crimea: Obama Hardest Hit? The foundations of Obama’s foreign policy have taken a serious beating over the weekend, with his desire to see a nuclear-free world perhaps one of the biggest casualties.

If I’m the Poles, the lesson I’d take is that if Ukraine had kept its nukes, this wouldn’t be happening, and if I want to be safe, I should get hold of some nukes myself. If I were Lithuania, even more so.

Related: Ukraine’s outdated and underfunded military no match for Russia.