Russia

Multiple recent incidents pose the risk of escalation into open conflict, the U.S. warns.

Russia regularly executes intercepts that are considered "unsafe and unprofessional."

U.S. troops were injured after a Russian vehicle hit a U.S. convoy, the White House's National Security Council confirmed.

China, Russia and Iran have watched how U.S. forces use space-based technologies on the battlefield.

The Marine Corps will overhaul its mission in Norway this fall, swapping its yearlong presence for shorter stints.

President Trump said he has never spoken to Putin about reports that bounties might be connected to deaths of U.S. troops.

Maj. Gen. Ekman said that Russian and U.S. troops do cross paths in Syria, but largely abide by deconfliction protocols.

The service is responsible for nearly 80 percent of the Defense Department's Arctic funding.

It’s official: the U.S. Air Force will buy the F-35 Joint Strike Fighter jets denied to Turkey .

The mercenaries are trying to blunt an offensive by the U.S.-backed government.