Later Monday, Syria's foreign minister, meeting with his Russian counterpart in Moscow, addressed the idea of getting rid of any chemical weapons.
"Syria welcomes the Russian proposal out of concern for the lives of the Syrian people, the security of our country and because it believes in the wisdom of the Russian leadership that seeks to avert American aggression against our people," said al-Moallem.
Kerry's comments came at a news conference with British Foreign Secretary William Hague and in response to a question about what, if anything, Assad could do to stop the U.S. from punishing it for the use of chemical weapons.
"Sure," Kerry replied. "He could turn over every single bit of his chemical weapons to the international community in the next week. Turn it over, all of it, without delay, and allow a full and total accounting for that. But he isn't about to do it, and it can't be done, obviously."
Traveling with Kerry, State Department spokeswoman Jen Psaki tried to blunt the suggestion.
"Secretary Kerry was making a rhetorical argument about the impossibility and unlikelihood of Assad turning over chemical weapons he has denied he used," she said. "His point was that this brutal dictator with a history of playing fast and loose with the facts cannot be trusted to turn over chemical weapons otherwise he would have done so long ago."
And, in a speech, Obama's national security adviser Susan Rice reiterated that the president had decided it is in U.S. interests to carry out limited strikes.
Al-Moallem and Lavrov had not reacted to Kerry's comments when they spoke to reporters immediately after their meeting. But Lavrov appeared before television cameras several hours later to say Moscow would urge Syria to quickly place its chemical weapons under international control and then dismantle them.