Damascus has deployed a new anti-missile system along the Syrian-Turkish border. The system will be able to intercept Turkish jets should they invade the country's airspace.
Previously, Turkey let Al-Qaeda militants cross the border: the militants had seized the border town of Kesab, mostly populated by Armenians. The Russian Foreign Ministry condemned the capture of Syrian civilians.
Not that long ago, Turkish air defense down a Syrian plane that illegally crossed the country's airspace.
Last week, Turkey banned YouTube video hosting service after the appearance of the video, in which senior Turkish officials discuss a possible invasion of Syria.
NATO's Boeing P-8 Poseidon was circling above the easternmost point of Romania at the time of the missile strike on the Black Sea Fleet headquarters in Sevastopol