Syria's chemical weapons must be destroyed or removed by mid-2014, under an agreement between the US and Russia. US Secretary of State John Kerry outlined a framework document under which Syria must hand over a full list of its stockpile within a week.
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If Syria fails to comply, the deal could be enforced by a UN resolution backed by the threat of sanctions or military force.
The US says the Syrian regime killed hundreds in a gas attack last month.
The government of Bashar al-Assad denies the allegations and has accused the rebels of carrying out the attack on 21 August.
In a joint news conference with Russian Foreign Minister Sergei Lavrov, Mr Kerry called on the Assad government to live up to its public commitments.
"There can be no room for games. Or anything less than full compliance by the Assad regime," he said.
Mr Kerry and Mr Lavrov said if Syria failed to comply, then a UN resolution would be sought under Chapter VII of the UN charter, which allows for the use of force.
Russia and the US have agreed on an assessment that the Syrian government possesses 1,000 tonnes of chemical agents and precursors, according to a US official.
The US believes the materials are located in 45 sites, all in regime hands, half of which have useable quantities of chemical agents, the official added.
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However, it is thought that Russians have not agreed the number of sites, nor that they are all under control.
'Important advance'
The agreement says initial on-site inspections must be complete by November.
It also stipulates that production equipment be destroyed by November, with "complete elimination of all chemical weapons material and equipment in the first half of 2014".
Mr Kerry outlined six points to the agreement:
The amount and type of chemical weapons must be agreed and "rapidly" placed under international control
Syria must submit within one week a comprehensive listing of its stockpiles
Extraordinary procedures under the Chemical Weapons Convention will allow "expeditious destruction"
Syria must give inspectors "immediate, unfettered access" to all sites
All chemical weapons must be destroyed, including the possibility of removing weapons from Syrian territory
UN will provide logistical support, and compliance would be enforced under Chapter VII
France and the UK both welcomed the agreement.
French Foreign Minister Laurent Fabius said it was an "important advance". France was the only country willing to join the US in taking military action in Syria.
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British Foreign Secretary William Hague said "urgent work on implementation" would now take place.
UN Secretary-General Ban Ki-moon also welcomed the news of the agreement and in a statement pledged "the support of the United Nations in its implementation".
However, the military leader of the anti-Assad Free Syrian Army rejected the deal and promised to continue fighting.
"There is nothing in this agreement that concerns us," said Gen Salim Idriss, describing it as a Russian initiative designed to gain time for the Syrian government.
Mr Kerry said he hoped the deal would help kick-start a wider peace process.
"We could also lay the groundwork for further co-operation that is essential to end the bloodshed that has consumed Syria for more than two years," he said.
"What we agreed on here today could conceivable be the first critical concrete step in that direction."
Mr Lavrov suggested there could be another international peace conference on Syria by October.
"The main thing is to make sure that all Syrian sides are represented at the conference," he said.
Over the years there have been several conferences, some of which have included the Syrian opposition and excluded the government.
More than 100,000 people have died since the uprising against President Assad began in 2011.
Millions of Syrians have fled the country, and millions more have been left homeless by the fighting.
Link to story & videos:
http://www.bbc.co.uk/news/world-middle-east-24091633
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