NATO countries putting forces on standby, reinforcing eastern Europe, alliance says

NATO allies are putting forces on standby and reinforcing NATO deployments in eastern Europe with more ships and fighter jets, Secretary-General Jens Stoltenberg said on Monday, in reaction to Russia's military build-up at Ukraine's borders.

"I welcome allies contributing additional forces to NATO," Stoltenberg said in a statement. "NATO will continue to take all necessary measures to protect and defend all allies, including by reinforcing the eastern part of the alliance."

Ukraine is not in NATO, but some of its neighbors including Poland are.