U.S. aid is critical not just for Ukraine, but for U.S. credibility in Russia and beyond.

Declining recruitment numbers are vexing nearly all branches of the U.S. military. Removing a medical bottleneck could dramatically streamline recruiting for applicants and personnel.

The war in Ukraine reflects collisions in Russia-Ukraine relations, Europe-Russia relations, and U.S.-Russia relations.

Policymakers face complex cost-benefit considerations when intervening in the market to mitigate perceived risks, from climate change to competition with China.

See how six countries are faring amid efforts to protect 30 percent of the planet’s land and waters by 2030, and what will be saved if they succeed.