Threats

Polish support for Ukraine brings lessons, but also risks

Warsaw is learning just what is killing its donated field guns, and battling Russian spy rings back home.

Exclusive Policy

EU plans to arm Ukraine bearing fruit, but more is needed, Estonia says

Ahead of a US visit, top defense ministry leader says effort to deliver a million artillery shells will likely reach its goal by next summer.

Threats

Putin’s chef meets his ‘window.’ What does that mean for the future of Ukraine?

The legacy of the world’s most famous mercenary leader is likely copycat organizations, and little else, experts say.

Threats

Russian jets playing chicken with US planes over Syria, officials say

Air Forces Central Command reports head-on passes; denies Russian state-run media reports U.S. is doing it, too.