Turkish-backed Syrian opposition forces on Tuesday struck back against Russian-supported government forces who had made gains in their campaign to eradicate the last opposition strongholds in northwest Syria.
Russian has officers on the ground advising the Syrians on the campaign and some ground forces, and Russian warplanes have carried out numerous air strikes.
Talks in Ankara between Turkey and a Russian delegation ended on Monday without agreement on halting the clashes, a Turkish diplomatic source said.
The Kremlin said on Tuesday all attacks on Russian and Syrian forces in Idlib must stop.
United Nations High Commissioner for Refugees spokesman Andrej Mahecic said the harsh winter weather was making their suffering worse and shelter was hard to find.
“Even finding a place in an unfinished building is becoming nearly impossible,” he said, adding that mosques were full.
One influential Turkish politician urged Erdogan to go further.