Russia and other hostile states have become increasingly brazen in adopting “gray zone” attacks against Europe and the United States, leaving defense officials with a dilemma: How to respond?

A man who pledged allegiance to the terrorist group carried out a deadly attack in New Orleans on New Year’s Day. By Alissa J. Rubin Liri Albag, 19, is one of about 100 hostages believed to ...

Sydney Harbour is an extremely busy waterway. It's used by recreational and commercial vessels, from big ships and high-speed ferries to small powerboats, yachts and kayaks. It has busy navigational ...