Russia’s moves to mobilize thousands more troops and to annex more of Ukraine’s territory signal a new, potentially more dangerous phase of the war.

Tensions over Israeli treatment of Palestinians in Jerusalem have spurred the worst violence between the two sides in years, but the eruption seems unlikely to prompt a strong international reaction…

The Trump administration has largely continued U.S. policies in Africa aimed at building economic ties, political stability, and health care, but it lacks a strategy for the continent’s looming geopo…

The collapse of the Cold War–era nuclear arms treaty signals trouble for U.S.-Russia relations, European security, and nonproliferation efforts.