It's inconceivable Turkey acted on its own, independent of US-dominated NATO. Its action is a major geopolitical incident - a premeditated act of war against Russia in Syrian airspace.
Ankara claiming the aircraft entered Turkish airspace, ignoring multiple warnings, has the distinct aroma of a bald-faced lie to cover up a hostile act.
Erdogan's recklessness has ruptured Turkish/Russian relations, at least for the time being. Sergey Lavrov cancelled his scheduled Wednesday trip to Istanbul, saying "(a) decision has been made to cancel the meeting at the level of Russian and Turkish foreign ministers..."
He urged Russian citizens to avoid visiting Turkey, leaving themselves vulnerable to terrorism, adding:
"It's necessary to emphasize that the terror threats with their roots in Turkey have been aggravated. And that's true even if we don't take into account what happened today. We estimate the threats to be no less than in Egypt."Russia's state tourism agency Rostourism recommended suspending tour package sales to Turkey. Moscow-based Natalie tours already did so.
Putin minced no words blasting Erdogan, saying:
"(t)his incident stands out against the usual fight against terrorism.Our troops are fighting heroically against terrorists, risking their lives. But the loss we suffered today came from a stab in the back delivered by accomplices of the terrorists."He also warned of grave consequences for Russian-Turkish relations.