Bogdanov said Moscow hoped that Syrian armed opposition would be able to attend the peace talks.
Bogdanov also said the United Nations' Special Envoy for Syria, Staffan de Mistura, would visit Moscow ahead of the Geneva talks.
De Mistura is trying to mediate a political agreement between Syria's warring sides, and after a procedural round of talks in Geneva ended on March 3, he plans to bring the negotiators back for in-depth discussions on March 23.