The three nations have been attempting to resolve the Syrian conflict at talks that started last year in Astana, Kazakhstan.

Russian Foreign Minister Sergei Lavrov said the three countries "must help the Syrians finish cleansing their country of terrorists."

The ministers emphasized the success of their peace talks in Astana, which Lavrov said are "firmly standing on their feet."

The Russian diplomat praised the "unique" alliance between two of Syrian President Bashar-al Assad’s key supporters, Moscow and Tehran, and rebel-backer Ankara.

"Thanks to it, it became possible to tackle the situation on the battlefield with the Islamic State group and the Al-Nusra Front," he said, as jihadists have lost most of the territory they controlled in Syria.

The conflict in Syria has lasted since 2011 and killed more than 350,000 people.

Critics of the Astana talks are "trying to show that they today decide all the affairs in our world, but fortunately their time has passed," Lavrov said.

The Russian foreign minister earlier held separate bilateral talks with his Turkish counterpart Mevlut Cavusoglu and then Iran’s Mohammad Javad Zarif, AFP reported.

"I curse those who carried out this massacre," Erdoğan said, welcoming Western air strikes in retaliation as "appropriate".

Reporter’s code: 50101