"We welcome that the world has joined this battle ... We welcome the partnership of the world in our battle against terrorism," Syrian National Coalition leader Hadi al-Bahra told a special ministerial meeting.
But he pleaded "for expedited assistance to put an end to the progress and aggression of" Islamic State group militants, which have seized a large area of Syria and sent some 200,000 Kurds fleeing from their villages in recent days.
American and British leaders pledged about USD 115 million in new funding to help the Syrian moderate opposition as it fights both the militants and the regime of Syrian President Bashar al-Assad.
US officials said the Department of Defense was moving to equip and train the moderate Syrian opposition which has been vetted, but warned it could take several months.
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"We have cooperation from Saudi Arabia and others to do the training. We haven't gotten into the specifics of equipment," a senior State Department official told reporters.
British Foreign Secretary Philip Hammond said his country would be increasing aid to 46 million pounds (USD 75 million).
And US Secretary of State John Kerry said the United States was boosting its non-lethal support by a further USD 40 million. Some USD 15 million was for communications, vehicles and meals for troops, with USD 26 million for building the civilian opposition.
"Today we made our commitment to work with the moderate opposition led by the Syrian National Coalition to turn that vision into a reality.