MOSCOW — Russian military officials denied responsibility for an airstrike in northern Syria that killed dozens of Turkish troops, as the risk of a major military confrontation between Russia and Turkey in the region escalated sharply. Russia’s Ministry of Defense issued a statement Friday stating that no Russian jets had been operating in the area of the strike in Idlib province Thursday. “Aircraft of the Russian Air Force did not engage in combat in the Behun vicinity,” the ministry said. Gov. Rahmi Dogan of Hatay province in Turkey, announced that 33 soldiers were killed. Dozens more were wounded. The Russian...