Iranian Foreign Minister Mohammad Javad Zarif and his Turkish counterpart Mevlut Cavusoglu met in capital Tehran on Thursday.

Iran press/Iran: "Visiting Tehran on the occasion of #Turkey-#Iran-#Russian Federation trilateral summit on Syria to be held tomorrow with the participation of President @RT_Erdogan. We had a meeting with Foreign Minister Mohammad Javad Zarif upon our arrival," Turkish Foreign Minister Mevlut Cavusoglu said on Twitter.

A trilateral summit will be held in Tehran, where Presidents Recep Tayyip Erdogan, Vladimir Putin and Hassan Rouhani will discuss Syria.

Turkey, Russia and Iran are guarantor countries of de-escalation zones in Syria.

The first tripartite summit was held in Russia’s Black Sea resort of Sochi on Nov. 22 to discuss progress made in the Astana peace talks and changes in de-escalation zones across Syria.

The second trilateral meeting was hosted by Erdogan in April in the Turkish capital Ankara.

Meanwhile on Thursday, Iranian foreign minister Mohammad Javad Zarif criticised Trump for trying to abuse an upcoming United Nations Security Council meeting to turn it into an anti-Iran event.

'There's only one UNSC resolution on Iran. @realDonaldTrump is violating it & bullying others to do same,' Mohammad-Javad Zarif wrote on his Twitter page referring to the attempts by the President to press US allies to tighten the noose on Iran's economy.