Iranian President Hassan Rouhani has said that Afrin should be handed over to Syria's army. "The two leaders agreed to stay in close contact about the situation", the White House said, providing no further details.
In recent months, however, Ankara has been working closely with Moscow, a major ally of the Assad government, on Syrian issues.
President Recep Tayyip Erdoğan hit out at worldwide investors on April 12, saying "no one could bring Turkey to heel using exchange rates", casting the recent sharp drop in the value of the Turkish Lira as a conspiracy by outside powers.
Turkey and Russian Federation have been on opposing sides of the conflict in Syria, with Moscow a chief ally of Assad but Ankara backing rebels seeking to oust him.
Meanwhile, Turkish Foreign Ministry Spokesman Hami Aksoy said that there are strong suspicions that the chemical attack in the Syrian town of Douma, in the Damascus suburb of eastern Ghouta was carried out by the Assad regime.
The Turkish defense minister's stark warning comes on the heels of several early morning tweets by Trump that intensified concerns that the U.S.is preparing to launch a military attack on Syria, risking a direct confrontation with Russian forces stationed in the country.
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The alleged chemical attack in rebel-held Douma near Damascus on April 7 sparked global outrage and warnings of possible military action.
The spokesman added that Turkey was among the sponsors of the draft resolution.
Several countries led by the US, including France and the United Kingdom, are weighing military strikes in response to the Douma chemical attack.
Turkish authorities often use the word "neutralised" in their statements to imply that the terrorists in question either surrendered or were killed or captured.
Speaking in Ankara, Mr Erdogan said Turkey would maintain its presence and activities in Syria until the country became safe for everyone.
"Those who support the regime of murderer Assad are making a mistake".