President Recep Tayyip Erdoğan and his Russian counterpart Vladimir Putin discussed in a phone call Friday the recent developments in Syria and Libya, ONA reports citing Daily Sabah.
According to a statement by the Turkish Presidency, Erdoğan told Putin that Assad regime attacks and violations of de-escalation deal in Idlib were causing a major humanitarian crisis and posed "very serious" threat to Turkey's national security.
Assad regime forces on Wednesday captured southern Idlib's Khan Sheikhoun town following two days of intense fighting with the opposition.
The latest Syrian regime offensive in the northwest has forced hundreds of thousands of people to flee toward the Turkish border.
Turkey and Russia agreed last September to turn Idlib into a de-escalation zone where acts of aggression are expressly prohibited.
The Syrian regime and its allies, however, have consistently broken the terms of the cease-fire, launching frequent attacks inside the area.