The congress is expected to be held in Russia's Black Sea resort of Sochi, but the date and participants are not clear yet.
Russian state TV is reporting that Vladimir Putin has met with Syrian President Bashar Assad in Sochi.
During the meeting, Putin was full of praise for the Syrian President and his work fighting ISIS.
The Russian president said a resolution of the Syrian political crisis must be based on the principles of preserving sovereignty, territorial integrity and the independence of Syria.
The fate of Assad remains a huge stumbling block, preventing global players from reaching a peace settlement over Syria's six-year war.
Putin will talk to USA counterpart Donald Trump on the telephone today after the unannounced meeting with the Syrian leader in Sochi.
Trump declares North Korea state sponsor of terrorism, triggers sanctions
It has since conducted five more nuclear tests and steadily ramped up its ballistic missile program, in violation of U.N. Two women are on trial for poisoning Kim Jong-nam with VX gas in a Malaysian airport last February.
Anti-government protests broke out in Syria in 2011, and the government's brutal response sparked a civil war that has wracked swathes of the country.
Putin himself said at his meeting with Assad that he planned to hold telephone talks with the USA presidents and the leaders of some of the Middle Eastern countries.
The US and Russian Federation also have wildly different visions for the future of Syria, with the two countries staking out different positions on Assad's future in the country and the involvement of rebel factions.
"Over this period great achievements were recorded both in the battlefield, as well as on the political level".
We expect to end the fight against terrorism in Syria soon, said Putin, who acknowledged that there will always be pockets of resistance by the extremists against which it will be necessary to fight.
They will also handle the delivery of humanitarian aid to Syria and possible contributions to the Geneva process toward a political solution in the country under U.N. Security Council Resolution 2254.