Crimea cancels flights as pro-Russian forces tighten their grip ahead of Sunday's referendum on whether to secede from Ukraine, whose interim prime minister is due to meet President Obama today.
And the US knew that Russia was laying the ground to make a move on the strategically useful peninsula. Doing something about it is another matter.
Snowden said his leaks have made the US safer.
Playing the petroleum card in world politics has a long history. But Russia's latest threat of gas cuts against Ukraine may finally push nations to embrace energy security and abundance as a peacemaking strategy.