The U.S. needs to refocus on its own crisis-ridden hemisphere.

The threat of China should bring the two former enemies into a tight security relationship.

The to-do list for 2020: Eliminate passwords, add end-to-end encryption, counter look-alike accounts.

We've seen before that the killing of a leader can make a terrorist group more resilient.

Turkey is a member of NATO, so why not use the alliance to forge peace along its Syrian border?

Climate change threatens many U.S. military installations, especially the navy's.

Beijing will be wary of overreacting to protests because of the effect that would have on its biggest goal: reunification with the "renegade province."

The purchase of a Russian missile defense is a severe blow to the alliance, but losing a key member would be worse.

A smarter approach involves the U.S. military and Homeland Security working with Mexico.