Ukraine

The U.S. frigate Taylor entered the Black Sea Wednesday along with a U.S. destroyer and a French intelligence ship.

The Pentagon is sending fighter planes to Bulgaria for training as the conflict in Ukraine continues to claim civilian lives.

Defense Secretary Ashton Carter said the U.S. is looking for compromise with Russia on Syria and Ukraine.

Defense Secretary Chuck Hagel sought assurances on Ukraine's sovereignty from Moscow Thursday after President Vladimir Putin...

Russia has bolstered its forces on Ukraine's borders in defiance of NATO, the Pentagon's chief spokesman said Thursday.

The U.S. will focus on economic sanctions against Russia and put Ukraine’s pleas for U.S. weaponry on the backburner.

A West Point graduate and former Army Ranger who honored his Ukrainian ancestry by defending the nation against Russian...

Air Force Gen. Philip Breedlove said that even with American weapons, Ukraine forces could not prevent a Russian invasion.

President Obama warned Russia Thursday that there would be consequences for aggression against Ukraine.

A Russian official is suggesting that American astronauts get to the International Space Station by using trampolines instead...