The head of NATO has slammed Russia's "troubling escalation" of military activities in Syria, a day after Moscow launched cruise missiles as part of an intensified air campaign against Syrian rebels.
Jens Stoltenberg made the comments Thursday as he arrived for a meeting of NATO defense ministers in Brussels, where Russia's intervention in the Syrian civil war is expected to be high on the agenda.
The issue took on more importance after reports this week that Russian jets involved in the Syrian air raids violated the airspace of Turkey, a member of the United States-backed military alliance.