Turkish President Tayyip Erdogan told Russia’s Vladimir Putin on Friday that Syrian army attacks in northwest Syria are causing a humanitarian crisis and threaten Turkey’s national security, the Turkish presidency said, reports Trend referring to Reuters.

Syrian troops have seized a pocket of territory and encircled rebels and a Turkish military post, reclaiming towns they lost early in the war.

Erdogan told Putin, who has supported Syrian President Bashar al-Assad, that the attacks violated a ceasefire in Idlib and damaged efforts for a solution in Syria, the Turkish presidency said.