The new U.S. aid package will reestablish a critical flow of weapons to Ukraine’s military, but the war will hinge greatly on which side can ramp up and sustain its firepower and troop numbers in the…

The two-year-old war in Ukraine—which is far from deadlocked—could pivot dramatically in the coming months. U.S. decisions will play a decisive role.

President Trump’s much-anticipated Afghan policy rightly avoids troop withdrawal timelines but offers little prospect for progress against the durable Taliban.

A little-known treaty provides transparency for confirming arms control agreements and serves as an important measure of the health of the U.S.-Russia relationship.

With the United States likely to pull back on global health funding, the World Health Organization, under its new director-general, will need to undertake serious structural and administrative change…