U.N. special envoy on Syria Staffan de Mistura attends a meeting with Russian Foreign Minister Sergei Lavrov in Moscow, Russia November 24, 2017. REUTERS/Sergei Karpukhin

MOSCOW (Reuters) - United Nations special envoy on Syria, Staffan de Mistura, said a meeting with Russian Foreign Minister Sergei Lavrov in Moscow on Friday was “useful”, Russia’s Interfax news agency reported.

He declined additional comments before the end of a Syria’s opposition meeting in Riyadh. He also said he planned to discuss Syria with Russia’s defense minister later on Friday.