Bolstered by infighting among Syrian opposition groups including some linked to al-Qaeda that have jeopardised foreign aid.
US officials say Assad has a stronger grasp on power now than he did just months ago, when the US and Russia called for a new round of talks to settle the two and a half-year war that has killed more than 100,000 people. Still, US Secretary of State John Kerry said Assad's recent gains do not assure his future in a new government.
"I don't know anybody who believes that the opposition will ever consent to Bashar al-Assad being part of that government," Kerry told reporters yesterday in Paris where he was participating in talks about another Mideast crisis, between Israel and Palestinian authorities.
"But I do not believe that it is dependent on whether you're up or down," Kerry said. "There's a human catastrophe awaiting the world if you can't have a negotiated solution."
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Britain's Foreign Secretary William Hague acknowledged that the longer the conflict drags on, the more sectarian it becomes.
"I am in no way glossing over or minimising the danger of extremism taking hold," he told the BBC yesterday as leaders gathered in London. "There are people fighting for extreme groups, not necessarily because of extreme views, but because that gives them access to weapons and training and so on - all the more reason why we have to help the moderate opposition in Syria."
"Who are the groups that will participate? What is their relation with the Syrian people? Do they represent the Syrian people or they represent the country that made them?" Assad said during an interview with Lebanon's Al-Mayadeen TV. "There are many questions about the conference.