Russia and Iran are the chief supporters of Syria, while Turkey backs some insurgent groups trying to remove President Bashar Assad from power.

Speaking at the annual Doha Forum, Sergey Lavrov said Russia continues to help the Syrian army confront insurgents via airstrikes. Asked whether Assad’s rule is threatened by the fast-moving rebel offensive, he said, “We are not in the business of guessing what’s going to happen.”

He blamed the United States and the West for the events in Syria and said, “We are very sorry for the Syrian people who became a subject of another geopolitical experiment”.

“We are doing everything we can not to make terrorists prevail, even if they say they are not terrorists,” Lavrov said, referring to the de facto leader of the Syrian insurgents, Abu Mohammed al-Golani, who says he has cut links with al-Qaeda. His group, Hayat Tahrir al-Sham, is listed as a terrorist organization by the U.S. and United Nations.

He said Russia, Iran and Turkey want the full implementation of a U.N. resolution, which endorsed a road map to peace in Syria. Resolution 2254 was adopted unanimously in December 2015.

The measure called for a Syrian-led political process, starting with the establishment of a transitional governing body, followed by the drafting of a new constitution and ending with U.N.-supervised elections.

Lavrov also downplayed reports that Moscow had withdrawn ships from Russia’s base in the Syrian city of Tartus, saying that the vessels had left to take part in naval exercises in the Mediterranean.