Mona Mahmood and Ian Black
London Guardian 
May 9, 2013
Syria’s main armed opposition group, the Free Syrian Army (FSA), is losing fighters and capabilities to Jabhat al-Nusra, an Islamist organisation with links to al-Qaida that is emerging as the best-equipped, financed and motivated force fighting Bashar al-Assad’s regime.
Evidence of the growing strength of al-Nusra, gathered from Guardian interviews with FSA commanders across Syria, underlines the dilemma for the US, Britain and other governments as they ponder the question of arming anti-Assad rebels.
John Kerry, the US secretary of state, said that if negotiations went ahead between the Syrian government and the opposition – as the US and Russia proposed on Tuesday – “then hopefully [arming the Syrian rebels] would not be necessary”.
The agreement between Washington and Moscow creates a problem for the UK and France, which have proposed lifting or amending the EU arms embargo on Syria to help anti-Assad forces. The Foreign Office welcomed the agreement as a “potential step forward” but insisted: “Assad and his close associates have lost all legitimacy. They have no place in the future of Syria.” Opposition leaders were sceptical about prospects for talks if Assad remained in power.