The White House said Monday it would take a hard took at Syria’s offer to give up its chemical weapons but expressed skepticism that country was willing to do so.

Deputy national security adviser Tony Blinken told reporters the White House would “welcome a decision by Syria to give up its chemical weapons” and was reviewing reports that Russia was urging Syria to do so.

But Blinken cautioned that it was “clear” Syria was making the offer because of the threat of a U.S. strike.