More On Ukraine

Russia has stepped up military air operations over Europe while continuing to bolster aggression by separatists in eastern...

The U.S. Air Force this month plans to deploy another squadron of A-10 Thunderbolt II attack aircraft to Europe in support of...

Defense Secretary Chuck Hagel has been unable to contact his counterpart in Ukraine to urge the military there to stay...

President Obama visited a World War I American cemetery in Belgium with a message to stand against aggression.

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.