The Turkish threat, along with NATOâ€™s unequivocal declaration of support, raised the risk of a confrontation along the 550-mile Turkish-Syrian border, which is already a focus of Syrian efforts to crush the15-month-old revoltÂ against President Bashar al-Assadâ€™s rule. Large swaths of the border region have fallen under rebel control, and the Syrian government routinely launches attacks in the area.
Turkish Prime Minister Recep Tayyip Erdogan said Tuesday in a strongly worded speech to members of parliament in Ankara that â€œany military element that approaches the Turkish border from Syria, posing a security risk or danger, will be regarded as a threat and treated as a military target.â€
â€œThis incident shows that Syria has become an open threat to Turkey, and so we have come to a brand-new stage,â€ he said.
Hours after he spoke, Turkish media reported that tanks and other heavy military equipment had been dispatched to the Syrian border area from a base in southeastern Turkey.
Erdogan made it clear that Turkey plans no immediate military retaliation for the downing of the jet on Friday. But by changing its rules of engagement along the border, Ankara is putting Syria on notice that it can no longer operate there with impunity. The action could curb Syriaâ€™s capacity to hunt down rebels in the northern province of Idlib, regarded as one of their strongholds.
Smuggling routes between Turkey and Syria are used by the rebel Free Syrian Army, which is based in a refugee camp in southern Turkey, to secure supplies of weaponry and money. The cross-border flow of rebels and refugees is one of the many sources of friction between Ankara and Damascus.
There have been several instances in recent months in which Syrian troops have fired into Turkey to target fleeing refugees or rebels, and Syrian helicopters have strayed into Turkish territory at least five times, Erdogan said.