Ukraine's military said 21 troops were killed and 40 injured in the operation in the Russian region where it is staging an incursion.

The complex web of North Korean state-backed hackers are allegedly behind major recent cyber incidents, targeting ...

U.S. Secretary of State Marco Rubio agreed Tuesday with his counterparts from Japan, Australia and India to strengthen a free ...

Ukrainian forces described a different kind of enemy, fighting with unfamiliar tactics and little option to retreat.