A Russian official said Moscow is ready to respond with military measures if the United States deploys its missile defense program to Greenland.

Steve Witkoff said it would be the first exchange for months, one that showed "advancing efforts to end the war in Ukraine."

Trump's Greenland focus highlights urgent Arctic security needs as Sen. Sullivan reveals new U.S. defenses against Sino-Russian threats in Alaska.

MOSCOW, Feb 5 (Reuters) - The Kremlin said on Thursday that Russia would continue taking a responsible approach to strategic nuclear stability, despite the expiry of the last nuclear arms control treaty between Moscow and Washington.

Ukrainian president says Abu Dhabi talks expected to lead to a fresh exchange, as US-led talks enter day two. What we know on day 1,443