Taiwan's Presidential Office conducted its first ever tabletop exercise simulating a military escalation with China, several officials briefed on the matter said, at a time when the island is facing renewed Chinese military threats.

Russian President Vladimir Putin apologized for the plane crash in Russian air space on Christmas Day that left 38 people dead in a statement that said Russia was targeting Ukrainian drones over the plane’s planned destination at the time, but stopped short of taking responsibility.

After an Azerbaijan Airlines jet crashed in Kazakhstan, speculation mounted about why the plane went down and whether possible Russian air defense action may have played a role.