Britain will review the current EU embargo on Syria in order to aid rebels, reported The Guardian on Wednesday.
With the US elections completed, Prime Minister David Cameron wants to push President Obama to prioritise Syria.
Cameron met Syrian refugees in Jordan on Wednesday, and a source claimed the visit persuaded him that a change in strategy is needed.
"I think what I have seen and heard today is truly appalling," said the Prime Minister.
"I think [with] a re-elected president [Obama] with a new mandate … it's really important to discuss what more we can do to help resolve the situation,
"That means more help for the opposition, more pressure at the UN, more help for the refugees, more work with the neighbours but also a general sort of: 'Look let's be frank what we've done for the last 18 months hasn't been enough.' The slaughter continues, the bloodshed is appalling, the bad effects it's having on the region, the radicalisation but also the humanitarian crisis that is engulfing Syria. So let's work together on really pushing what more we can do, what other steps we can take to hasten the end of this regime."
In another sign of a shift, the Foreign Office said it will talk to "military figures in the armed opposition".
Up to now the Foreign Office only allowed talks with political leaders of opposition groups.
