Ukraine

President Obama will be seeking a united front at the NATO summit for support of Ukraine against Russia.

The Army has put off sending U.S. troops on a training mission to western Ukraine while waiting to see whether a ceasefire...

Russia issued an ultimatum to Ukrainian sailors in the Crimea to surrender and give up their ships or face attack, Ukraine...

The guided-missile destroyer Donald Cook's passage into the Black Sea was denounced by Moscow.

Defense Secretary Hagel called on NATO allies to boost defense spending to prepare for the threat of an expansionist Russia.

The U.S. will support an expanded and more agile rapid reaction force within NATO to counter the growing threat from Russia...

Thirteen months after Russia began its occupation of Crimea, the United States and its European allies must remain steadfast.

The U.S. and its NATO allies have trained with the Ukraine military and pumped millions of dollars into that country's...

The Russian buildup of military forces threatening Ukraine was real and Moscow’s denials were baseless, NATO officials said.

Western allies bolstered Eastern Europe defenses as Ukraine pressed an offensive against pro-Russian militants.