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The Syrian National Coalition's Monzer Akbik told Channel 4 News that despite the Government's defeat over military action "the UK is one of the important friends of the Syrian people".
He added: "There are many ways that the UK can help the Syrian people, by humanitarian aid, by helping build institutions, by helping the reconstruction of the country after all this destruction."
Earlier William Hague held talks with the Syrian National Coalition president Ahmad Al-Jarba in London and said the UK remained "fully behind" the opposition.
Speaking after meeting Syrian opposition leaders William Hague said:
Foreign Secretary William Hague has met with leaders from the Syrian National Coalition in London to discuss how the UK can remain involved in seeking a political solution to solve the crisis.
Deputy Prime Minister Nick Clegg said he regretted Labour leader Ed Miliband could not "rise to the occasion" and vote with the government for a military strike against Syria.
Speaking on LBC radio he said he was frustrated that the parties worked together to propose the motion, only for the house to be divided during the vote.
"We changed our motion constantly. Even right up to the last minute we changed it to accept a succession of suggestions they made.
"Then they came up with a rival motion to divide the house rather than unite it, even though the motions were ... to all intents and purposes the same.
"That was when I just really thought, surely we can rise to the occasion and try and not create rival motions that say almost exactly the same thing, but try to act in the national and international interest."
Syrian opposition leaders will meet Foreign Secretary William Hague to discuss what role the UK could play in bringing about a political solution to the conflict in Syria.
Monzer Akbik of the Syrian National Coalition (SNC) said other countries would form a "coalition of the willing" to launch strikes against Assad even without the UK's involvement.
He told BBC2's Newsnight that the international community had a duty to "take measures in order to paralyse the ability of the war machine of the regime to kill".