The future of the democratic world will be determined by whether the Ukrainian military can break a stalemate with Russia and drive the country backwards—perhaps even out of Crimea for good.

Ask people why they're camped out in Kiev's streets, and you'll get a multitude of answers. Will that doom the protest movement? 

“If the president can simply refuse all oversight, particularly in the context of an impeachment proceeding, the balance of power between our two branches of government will be irrevocably altered.”

Smaller-scale tactical nuclear weapons could bring the great powers into a brutal, deadly, and unprecedented conflict.

Putin’s order to raise Russia’s nuclear-alert status is aimed as much at a domestic audience as it is at the West.

After losing public confidence with the Afghanistan debacle, the president now has the opportunity to reset.

Germany has long argued that importing natural gas from Russia would help keep peace. That strategy is being tested now.

This is terra incognita for economic policy. No country has ever faced this kind of global freeze-out.

On the intellectual bankruptcy of moral equivalence