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

When we were investigating Benghazi, we would have moved to impeach if armed with such clear evidence.

If Republicans thought Kurt Volker and Timothy Morrison would bust the Democrats’ case for impeachment, they were likely disappointed by what they heard today.

How the vice president spent a few of his closing days in office