Russia

U.S. analysts believe as many as 4,000 Russian troops may have been killed in the 13 days since Russia invaded Ukraine.

"The performance of Ukraine's military has been surprisingly strong against the larger and better equipped Russian military."

U.S. national security leaders, a retired CIA official says, should expect a shock on the order of Japan’s sneak attack on...

The former Coast Guard cutter Cushing, commissioned by the Ukrainian Navy as the Sloviansk, was destroyed during an airstrike...

The Pentagon has deployed some 12,000 troops to NATO member nations within spitting distance of Ukraine.

The command, based in Germany under Air Force Gen. Tod Wolters, is coordinating shipments to the war zone from 14 countries.

Gaining a window into Putin's mindset has long been a difficult task for US intelligence agencies.

Kendall is one of the first military service branch leaders to publicly speak out about Russia's missteps since Putin ordered...

The White House has asked Congress for $10 billion to respond to the war in Ukraine, including $4.8 billion for the Pentagon.

The Pentagon has scrubbed a scheduled test launch of a Minuteman III to show Putin that the U.S. is not interested in nuclear...