(reuters) -- The event, called the Syrian Congress on National Dialogue, was first mentioned by President Vladimir Putin last month who said he believed that militants in Syria would soon be defeated.

It is due to be held in the Black Sea resort of Sochi.

But while Damascus has backed the Russian plan, some opposition groups have rejected the idea, calling it an attempt to rehabilitate President Bashar al-Assad's government. They have said they will stick to U.N.-brokered Geneva peace talks.

Asked if Moscow still hoped to see opposition groups like the High Negotiations Committee, which has refused to come, attending, Interfax cited Bogdanov as saying:

"We hope that everyone who believes that the fate of the country, its unity, its territorial integrity and its sovereignty are important will participate."

(File Photo: by Georgi Gotev, euractiv)