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Syria crisis: Obama says world's credibility on the line

media captionBarack Obama: "The world set a red line when the governments representing 98% of the world's population said the use of chemical weapons are abhorrent"

President Barack Obama has said the credibility of the US, its Congress and the international community is on the line over their response to Syria's alleged use of chemical weapons.

Speaking in Sweden, he said the world should stick to its own "red line" against the use of chemical weapons.

Mr Obama is trying to build support in the US for punitive military action against the Syrian government.

Congress will vote next week on whether to support his plans.

France - whose government has strongly advocated intervention - held an extraordinary debate on Wednesday in the National Assembly, though MPs will not vote on the matter as the president can mobilise the military without their backing.

media captionFrench Prime Minister Jean-Marc Ayrault: ''Bashar al-Assad has become a war criminal and has committed a crime against humanity''

Prime Minister Jean-Marc Ayrault said it was France's duty to act and that "faced with barbarism, doing nothing is not an option".

Inaction would "put peace and security in the entire region in danger", he said, and "close the door on a political solution" to the conflict.

The UK parliament voted last month against military intervention.

Jordan's Prime Minister Abdullah Ensour told the BBC that it would back intervention in neighbouring Syria if proof emerged that chemical weapons had been used.

But he said any strikes would have to be precise, and that Jordan itself would not be involved.

'World's red line'

The government of Syrian President Bashar al-Assad is accused of using chemical weapons against civilians on several occasions during the 30-month conflict, most recently on a large scale in an attack on 21 August on the outskirts of Damascus.

media captionPrime Minister Abdullah Ensour: "It would be a very exact hit to the chemical weapons, and not hurt the civilians"

The US has put the death toll from that incident at 1,429 - though other countries and organisations have given lower figures - and says all the evidence implicates government forces.

President Assad has said such an attack would have been "illogical" because UN chemical weapons experts were visiting Damascus at the time.

Mr Obama has said the evidence gives him "high confidence that Assad carried this out" and that action must be taken to deter the regime from using chemical weapons again and degrade its ability to do so.

On Tuesday, senior members of the Senate Committee on Foreign Relations agreed a draft resolution on military action to go before Congress, specifying that any operation would be "limited and tailored" and prohibit the use of ground forces.

They later approved authorisation for the US use of military force in Syria by 10-7.

The full committee may vote on the draft on Wednesday.

Mr Obama has won the support of key Congressional leaders, though influential Republican John McCain said there were "number of people who are unhappy".

So far, only 21 senators have said they support or are likely to support the resolution, according to a tally by ABC News.

Thirteen have said they oppose or are likely to oppose the resolution, while 66 votes are undecided or unknown.

However those numbers are expected to shift as the language in the resolution changes, the White House and their congressional allies apply pressure, and lawmakers hear from their constituents.

Separately, Secretary of State John Kerry and Defence Secretary Chuck Hagel pressed the Obama administration's case in the US House of Representatives on Wednesday.

Mr Hagel said any US military strike at Syria would not be a mere "pin prick" but would reduce Syria's military capability. He said he thought the likelihood was "very high" that Mr Assad would use chemical weapons again if the US did not act.

The defence secretary estimated the cost of such a strike would be in the "tens of millions" of US dollars.

In prepared remarks, Mr Kerry said "the world is wondering whether the United States of America is going to consent with silence".

Among the audience at the panel were several people with signs opposing US action, their palms coloured in red.

media captionThe BBC's Jeremy Bowen meets Damascus residents forming a 'human shield' to protect key military sites

In Stockholm, Mr Obama said he did not believe he had risked his credibility by asking Congress to vote - something he was not constitutionally obliged to do.

"My credibility is not on the line. The international community's credibility is on the line," he said.

"America and Congress's credibility is on the line, because we give lip-service to the notion that these international norms are important."

Mr Obama, who has previously said the use of chemical weapons would cross a "red line", told reporters it was not him who set this line but the world, "when governments representing 98% of the world's population said the use of chemical weapons are abhorrent and passed a treaty forbidding their use even when countries are engaged in war".

"Congress set a red line when it ratified that treaty," he added.

He said he believed Congress would approve intervention, but stressed that as commander-in-chief, he had the right to act in his country's national interest regardless.

Russia remains firmly opposed to military action.

President Vladimir Putin warned on Wednesday that any strike without UN approval would be "an aggression".

But he said Russia did not rule out supporting a UN Security Council resolution authorising force, if it was proved "beyond doubt" that the Syrian government had used chemical weapons.

In Syria, Deputy Foreign Minister Faisal Mekdad said Damascus was mobilising its allies, who were "offering it all sorts of support".

"Iran, Russia, South Africa and some Arab countries have rejected this aggression and are ready to face this war," he told the AFP news agency.

Meanwhile, Syrian state TV denied reports that a former Defence Minister, General Ali Habib, has defected.

The opposition Syrian National Coalition movement told Reuters that Mr Habib had fled to Turkey, but the Alikhbaria news channel said he was still at his home.

The United Nations says more than 100,000 people have been killed since the uprising against President Assad began in March 2011.

On Tuesday, the UN's refugee agency said more than two million Syrians were now registered as refugees, and an estimated 4.25 million had been displaced within Syria, making it the worst refugee crisis since the 1994 genocide in Rwanda.

At a meeting at the UN in Geneva on Wednesday, the foreign ministers of Lebanon, Jordan, Turkey and Iraq - which border Syria - called for more international support to help them handle the huge numbers arriving in their countries.

The BBC's Imogen Foulkes at the UN said they were frustrated and dismayed at the lack of a political solution to the Syrian conflict, and at the lack of help.

They are expected to ask for funding and in some cases, for help resettling some refugees in other countries, possibly in Europe.