Mikhail Bogdanov said on Wendesday that United Nations special envoy on Syria Staffan de Mistura announced this information.

The Syrian government said on Tuesday that it had held a final session of talks with de Mistura in a “useful and productive round”.

Staffan de Mistura was asked to brief the Security Council on Wednesday at a closed-door meeting.

Update: According to Reuters, a spokeswoman for Staffan de Mistura said in an email that talk about May 10 was speculation and that no date had been set.