The five permanent UN Security Council members are meeting to discuss a resolution on making safe Syria's chemical weapons.

A resolution is seen as a key step in a US-Russia brokered plan under which Syria will disclose its arsenal within a week and eliminate it by mid-2014.

However, there have already been key disagreements over the wording.

France, the UK and US want a resolution carrying the threat of military action but Russia opposes this.

The US and Russia hammered out their plan last weekend after Washington had threatened the Syrian government with military action over a chemical weapons attack in the Ghouta area of Damascus on 21 August.

A UN report on the attack published on Monday confirmed that the nerve agent sarin had been used in a rocket attack there, although it did not apportion blame.

France, the UK and US insist the report clearly backs their stance that only the government forces were capable of carrying out the attack.

Russia rejects this argument. Foreign Minister Sergei Lavrov said on Tuesday that Moscow had "serious grounds" to believe the attack had been a provocation by rebel forces.

Syrian President Bashar al-Assad also says the opposition forces were to blame.
'Provocation'

Tuesday's meeting of envoys of the so-called P5 - France, the UK, the US, Russia and China - was confirmed in an email sent by Erin Pelton, a spokeswoman for the US mission to the UN.

It will discuss a draft resolution put forward by the UK, France and the US.

"In order to respect the integrity of these negotiations, we will not be reading out the details of today's meeting or the draft resolution," she said.

Earlier, the disagreements were highlighted at a meeting between Mr Lavrov and French Foreign Minister Laurent Fabius in Moscow.

Referring to the UN's findings, Mr Fabius said: "When you look at the amount of sarin gas used, the vectors, the techniques behind such an attack, as well as other aspects, it seems to leave no doubt that the regime [of President Assad] is behind it."

But Mr Lavrov said: "We have serious grounds to believe this was a provocation... But the truth needs to be established and this will be a test of the future work of the Security Council."

He said any UN resolution on the Syrian chemicals issue should not contain the threat of military action.

A resolution under Chapter VII of the UN charter permits military action if other measures do not succeed. Chapter VI requires a purely negotiated solution.

The BBC's Daniel Sandford in Moscow says Russia has delivered a promise from Syria to give up its chemical weapons, and it seems that at this stage Moscow does not feel like giving the Western allies anything more.

Russia and China have three times blocked Western-backed Security Council resolutions against Mr Assad.

In other developments on Tuesday:

A car bomb exploded at the Bab al-Hawa crossing point with Turkey. Activists told Reuters news agency the blast struck a roadblock manned by Islamist brigades and that a number of people were hurt
UN emergency relief co-ordinator Valerie Amos says seven million people are in urgent need of humanitarian aid, with funding of $4.4bn (£2.76bn) required this year, of which only $1.84bn has been raised
Russian Deputy Foreign Minister Sergei Ryabkov was to meet Syrian Foreign Minister Walid Muallem on Tuesday in Damascus, Russia's Interfax news agency reported
Human Rights Watch says any resolution at the UN should include referring the Syrian government to the International Criminal Court

'War crime'

UN Secretary-General Ban Ki-moon has described the attack in Ghouta as a war crime.

The UN investigators examined blood, hair, urine and rocket samples from the scene of the attack.

Mr Ban said 85% of the blood samples had tested positive for sarin.

The report did not attribute blame, as that was not part of its remit.

Mr Ban said the mission was unable to verify the number of casualties, but referred to the "terrible loss of life on 21 August".

More than 100,000 people have died since the uprising against President Assad began in 2011.

Millions of Syrians have fled the country, mostly to neighbouring nations. Millions more have been internally displaced.

BBC