The Turkish government of President Recep Tayyip Erdogan has openly called for the toppling of Syrian leader Bashar al-Assad. The Turkish strongman regularly refers to al-Assad as a “terrorist” and blames him for clandestinely supporting Kurdish paramilitaries, who have waged a war of secession against Ankara for several decades, Intelnews reported.

Regional dynamics shifted radically since early 2017, however, when the United States began withdrawing from the conflict. In the following months, Washington lifted its support for a collection of rebels fighting against the Syrian president. Last year, the US military left northern Syria and allowed Turkish troops to invade the region, with the aim of repelling armed Kurdish units from the Syrian-Turkish border.

Throughout this time, there have been rumors of intelligence coordination between Ankara and Damascus, but no official acknowledgement was ever issued. On Monday, however, Syria’s government-owned news agency, SANA, said that a meeting had taken place in Moscow between the heads of intelligence of Syria and Turkey. Shortly afterwards, a number of anonymous Turkish officials confirmed these reports to the Reuters news agency.

Reuters reported that the two sides discussed the state of the ceasefire in Syria’s northwestern Idlib province, and future steps aimed at coordinating against the presence of armed Kurdish separatists in northern Syrian regions. It quoted one Turkish official who said that the two intelligence agencies were exploring “the possibility of working together” against Kurdish groups on both sides of the Turkish-Syrian border.

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