AVA- That was announced by the Russian mission to the United Nations in an email seen by AFP on Monday.
The UN Security Council member states are expected to hear the briefing on Tuesday at 4 pm (GMT).
The trilateral Tehran Summit, held on September 7, was attended by Iranian President Hassan Rouhani, Russian President Vladimir Putin, and Turkish President Recep Tayyip Erdoğan.
At the end of the Tehran Summit, the three presidents issued a joint statement, reaffirming their determination to maintain their cooperation until the eradication of terrorist groups in Syria.
In the statement, Rouhani, Putin and Erdoğan "reaffirmed their determination to continue cooperation in order to ultimately eliminate Daesh, al-Nusra Front and all other individuals, groups, undertakings and entities associated with al-Qaeda or Daesh, as they have been designated as terrorists by the UN Security Council."
"They underlined that, in the fight against terrorism, separation between the above-mentioned terrorist groups and the armed opposition groups that had joined or would join the ceasefire regime, would be of utmost importance including with respect to preventing civilian casualties," it added.
The three presidents agreed to hold the next round of their meeting in Russia.
Iran, Turkey, and Russia are the three guarantor states of the Astana process, a track of negotiations which have resulted in the return of a succession of militant bastions to the government fold and movement of civilians to safe zones.
Tuesday 11 September 2018 21:42