foreign ministers from the u.s., russia, china and other united nations security council members have agreed on a resolution endorsing a way forward on a cease-fire and peace negotiations to end the syrian civil war. but a main sticking point between members continues to be the future of syrian president bashar al assad. the security council has adopted new measures to cut off funding for isis which brings in hundreds of billions of dollars. correspondent benjamin hall tonight from london on trying to put an end to the business that keeps isis in the terror business. >> stop the flow of isis oil and we will stop isis. this has been a major u.s. policy since bombing raids against the terrorist group began. but documents from inside isis have shown the bulk of their vast wealth is not derived from oil. last year the terrorist group is said to have made $900 million, but as little as 28% of that came from resources. another 4% came from