A Turkish soldier was killed in Syrias Idlib region in a bomb attack by Russian-backed regime forces, the defense ministry said on Saturday, Turkeys 16th military death during a month in which talks between Ankara and Moscow have stalled. The rising Turkish military death toll, including two on Thursday, could complicate a possible deal to halt a spike in fighting in Syrias northwest. Since early December nearly a million Syrians, mostly women and children, have been displaced in the winter cold there. Turkish President Recep Tayyip Erdogan said he will meet Russian, German and French counterparts on March 5 to discuss Idlib, where regime forces are pushing to retake the last large opposition-held region after nine years of war in the country. Turkey has sent thousands of troops and equipment to the region just south of its border to head off the campaign driven by Russian air raids. It already hosts 3.7 million Syrian refugees, says it cannot handle another wave and has closed its borders. Turkish forces retaliated to the bomb attack Saturday and destroyed 21 "regime targets", the ministry said, adding the soldier was a tank mechanic who died when transferred to hospital. After Russian and Turkish delegations failed to reach an agreement in the last two weeks, Erdogan has promised to push back regime forces if they press on. Turkey has "determined our road map" for Syria after calls on Friday with Vladimir Putin, Angela Merkel and Emmanuel Macron, Erdogan told supporters in Izmir on Saturday. "I expressed our determination clearly" to them, he said. The German and French leaders expressed concern about the humanitarian situation in Idlib and urged an end to the conflict, while the Kremlin has said it is discussing the possibility of holding a four-way summit. The United Nations has warned fighting in Idlib could "end in a bloodbath" and called for a ceasefire. The latest Syrian offensive has prompted the biggest civilian exodus in a war that has killed an estimated 400,000 Syrians, displaced millions more and left much of the country in ruins. Separately in Syrias northeast, the UN has suggested that the Tal Abiyad border crossing between Syria and Turkey could be used to deliver aid to civilians after Russia and China blocked the world body from using a crossing point on the Iraqi border to provide help.