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Moscow • A tug-of-war over a Russian warplane downed by a Turkish fighter jet at the border with Syria escalated Thursday, with Moscow drafting a slew of economic sanctions against Turkey and the Turkish president defiantly declaring that his military will shoot down any new intruder.

The spat reflected a clash of ambitions of two strongman leaders, neither of whom appeared willing to back down and search for a compromise.

Turkey shot down the Russian Su-24 military jet on Tuesday, insisting it had violated its airspace despite repeated warnings. The incident marked the first time in half a century that a NATO member shot down a Russian plane, raising the threat of a military confrontation between the alliance and Moscow.

Russian President Vladimir Putin denounced the Turkish action as a "treacherous stab in the back," and insisted that the plane was downed over Syrian territory in violation of international law.

"Until that moment, we haven't heard a clear apology from Turkey's top political leadership, or an offer to compensate for the damage or a promise to punish the criminals," he said at the Kremlin while receiving credentials from several ambassadors. "It gives an impression that the Turkish leadership is deliberately driving Russian-Turkish relations into a deadlock, and we regret that."

But Turkish President Recep Tayyip Erdogan was in no mood to apologize, and warned that Ankara would act in the same way in the event of another intrusion.

"Faced with the same violation today, Turkey would give the same response," Erdogan said. "It's the country that carried out the violation which should question itself and take measures to prevent it from happening again, not the country that was subjected to a violation."

Erdogan said Turkey had not specifically targeted Russia when it shot down the plane, saying it was "an automatic response" in line with its rules of engagement.

He spoke on a more conciliatory note in separate comments on France. Asked if Turkey would still have targeted the plane if it positively knew it was Russian, he said: "If we had determined it, the warnings would have been different."

Speaking later in the Kremlin after the talks with French President Francois Hollande, Putin said he was sorry to hear that Erdogan sees no need to apologize.

"For us, Turkey was not just a neighbor, but a friendly state, almost an ally," he said. "It's very sad to see all of it being destroyed so thoughtlessly and brutally."