Russia confirmed Tuesday that one of its fighter jets had been shot down near Syria’s Turkish border. Turkey’s military had reported earlier that two of its F-16s had fired on the aircraft after it violated Turkish airspace “despite several warnings.” Russia denied its jet crossed into Turkey. One of the plane’s two pilots was reportedly found dead by Syrian rebels; the fate of the other was not immediately clear. Turkey, a NATO member, had warned Russia against violating its airspace in October. Two weeks later it shot down a Russian drone, but the downing of a fighter jet marks a potentially dangerous escalation.