The killing of Turkish soldiers, even if perpetrated by the Assad regime, is a watershed moment for Turkey-Russia relations.
If the West and NATO continue on the path they have chosen, it will allow Vladimir Putin to reshape the post-Soviet world order in his image.
Ankara and Damascus appear to be heading towards a military confrontation as Russia, the main backer of the Assad regime, fails to stick to its word on Idlib.
The Kremlin is positioning itself as indispensable to Sudan while it bids to increase its sway over Africa and Muslim countries.
Russia-backed Syrian regime onslaught in Idlib province has reached a "horrifying new level," says Mark Lowcock, UN head of relief affairs, adding babies are dying of cold because aid camps are full.
Turkish and Russian delegation will meet in Moscow to discuss Idlib violence, Turkey's FM Mevlut Cavusoglu says, amid mounting fears of humanitarian disaster in Syrian province.
Leaders of Turkey and US agree by phone that Syrian regime attacks on Turkish troops in northwestern Idlib province were unacceptable, Turkish presidency says.
Turkey's Vice President Fuat Oktay says Turkey was determined to stop Syrian regime advances in Idlib and Ankara had clearly conveyed its position on Idlib to Moscow.
Turkey's President Erdogan says a resounding blow has been dealt to Bashar al Assad's regime over attack on Turkish soldiers.
The warnings of planted bombs, all of them false, have been sent to numerous Russian cities, but particularly targeted the capital, where around 16 million live and work, with up to 1,000 threats per day.
At least nine civilians were killed in Ibn Semaan village of Aleppo province, war monitor SOHR says, adding 20 other civilians were killed in neighbouring provinces of Idlib and Aleppo.
"We on every occasion say 'do not force us, otherwise our Plan B and Plan C are ready'," Turkey's Defence Minister Hulusi Akar tells Hurriyet newspaper. Meanwhile, Syrian regime is set to retake key M5 highway, a war monitor says.
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