The U.S. effort to train and equip the Ukrainian military demonstrates the key factors for successful military aid.

The United States and United Nations remain critical actors in the diplomacy to resolve the civil war.

The increasing frequency of natural disasters will exacerbate some wars while providing opportunities to resolve others.

The shift to "over-the-horizon" operations has removed important building blocks in U.S. counterterrorism strategy.

Russia has pursued four strategies to mitigate the effects of sanctions, with mixed results.

With a little help from its friends, Ukraine can guard its maritime security in the Black Sea and protect its critical grain exports.

How community social cohesion shapes population displacement, one of today’s greatest global challenges.

Domestic terrorism legislation is still useful—even if Jan. 6 rioters have been prosecuted without a federal law on the books.

Policymakers and cable industry insiders disagree about the threats to critical infrastructure and how to address them, but greater dialogue could help.

The Islamic State and other groups are experimenting with using drones and may be close to weaponizing them.

Personalist leaders present unique challenges for deterrence.

Putin has cultivated ties with a network of far-right actors at the fringes of European politics.