GENEVA -- A diplomatic breakthrough Saturday on securing and destroying Syria's chemical weapons stockpile averted the threat of U.S. military action for the moment and could swing momentum toward ending a horrific civil war.
Marathon negotiations between U.S. and Russian diplomats at a Geneva hotel produced an agreement that will require one of the most ambitious arms-control efforts in history.
The deal involves making an inventory and seizing all components of Syria's chemical weapons program and imposing penalties if President Bashar Assad's government fails to comply with the terms.
After days of day-and-night negotiations between Secretary of State John Kerry and Russian Foreign Minister Sergey Lavrov and their teams, the two nations announced that they had a framework for ridding the world of Syria's chemicals weapons.
The United States says Assad used them in an Aug. 21 attack on the outskirts of Damascus, the capital, killing more than 1,400 civilians. That prompted President Obama to ready American airstrikes on his order -- until he decided last weekend to ask for authorization from Congress. Then came the Russian proposal, and Obama asked Congress, already largely opposed to military intervention, to delay a vote.
Kerry and Lavrov said they agreed on the size of the chemical weapons inventory, and on a speedy timetable and measures for Assad to do away with the toxic agents.
Syria, a Moscow ally, kept silent on the development, while Obama made clear that "if diplomacy fails, the United States remains prepared to act."
The deal offers the potential for reviving international peace talks to end a civil war that has claimed more than 100,000 lives and sent 2 million refugees fleeing for safety, and now threatens the stability of the entire Mideast.
Kerry and Lavrov, along with the U.N.-Arab League envoy to Syria, Lakhdar Brahimi, said the chances for a follow-up peace conference in Geneva to the one held in June 2012 will depend largely on the weapons deal.
The United States and Russia are giving Syria just one week, until Saturday, to submit "a comprehensive listing, including names, types and quantities of its chemical weapons agents, types of munitions, and location and form of storage, production, and research and development facilities."
International inspectors are to be on the ground in Syria by November. During that month, they are to complete their initial assessment and all mixing and filling equipment for chemical weapons is to be destroyed. They must be given "immediate and unfettered" access to inspect all sites.
All components of the chemical weapons program are to be removed from the country or destroyed by mid-2014.
"Ensuring that a dictator's wanton use of chemical weapons never again comes to pass, we believe is worth pursuing and achieving," Kerry said.
For the moment, the deal might not do much to change the fighting on the ground, but the impasse in the international community over how to react could ease somewhat with the United States and Russia also agreeing to immediately press for a U.N. Security Council resolution that enshrines the weapons deal.
They will seek a resolution under Chapter 7 of the U.N. Charter, which can authorize the use of force, as well as nonmilitary measures.
However, Russia, which already has rejected three resolutions on Syria, would be sure to veto a U.N. move toward military action, and U.S. officials said they do not contemplate seeking such an authorization.
"The world will now expect the Assad regime to live up to its public commitments," Kerry said at a news conference at the hotel where the negotiations were conducted since Thursday night. "There can be no games, no room for avoidance or anything less than full compliance by the Assad regime."
Kerry and Lavrov emphasized that the deal sends a strong message, not just to Syria, but also to the world, that the use of chemical weapons will not be tolerated.
Lavrov added, cautiously, "We understand that the decisions we have reached today are only the beginning of the road."
U.S. officials said the United States and Russia agree that Syria has roughly 1,000 metric tons of chemical agents and precursors, including blister agents, such as sulfur and mustard gas, and nerve agents, like sarin.
These officials said the two sides do not agree on the number of chemical weapons sites inside Syria.