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The Russian envoy to the talks warned that a simple solution to the six-year conflict is unlikely.
Ties between Moscow and Washington have for the past two years been strained due to the Syria and Ukraine crises.
A number of Syrian opposition groups will be participating in the talks.
The pipeline replaces one initially planned through the Balkans but scrapped due to the conflict in the Ukraine.
The joint operation marks a remarkable turnaround in Russo-Turkish ties.
Snowden, who has pleaded for Manning's clemency, thanked Obama in a Tweet early Wednesday.
The Russian FM said that Chinese and Russian leaders have an identical position when it comes to North Korea.
Tensions are high between both countries, as the FBI continues to probe whether Russia may have interfered with US elections.
The US Defense Secretary had blamed Russia for doing "virtually nothing" to fight ISIL in Syria.
Duterte is expected to visit Moscow in April, furthering throwing doubt on the strength of ties with historic ally Washington.