grounds access isn't possible to der azzor. the u.n. says the only way this is by air. >> we will also hope, then, to have progress in reaching the poor people inside of the city of der azzor which is besieged by islamic state. that can only be done by air drops and the program has a concrete plan of doing so. it is complicated and would be the first of its kinds ever >> reporter: in south sudan the world food program has dropped supplies from the air. they're expensive and difficult to organise. >> even if in aleppo, even in the eastern border, many other places are places where people are in need of help. >> reporter: planes will have to fly high above the fighting to avoid coming up fire. >> if there were any air drop i think involved, any air drop in syria, it would be a high altitude air drop which would demand some very specific skills and experience in terms of doing these kinds of air drops. so that's why they are considering using one of their contractors which has worked with them in south sudan. >> reporter: u.n. officials st

ground access is not possible to der azzor. the only way this is by air >> we will also hope then to have progress in reaching the poor people inside of the area besieged by islamic state, der azzor. that can only be done by air drops and the program has a concrete plan of doing so, it is a complicated operation and it would be in many ways the first of its kind ever >> reporter: in south sudan the world food program has dropped supplies from the air which is sometimes the only way to save lives. it is not just der azzor has needs to be met from above >> many other places is where people are in need of help. >> reporter: planes will have to fly high above the fighting to avoid coming under fire. russia aircraft are often in action prompting questions at journalists in new york about using officials. >> if there were any air drop involved, in syria, the wfp planning would be a high altitude air drop which would demand some very specific skills and experience in terms of doing these kinds of air drops. that's why they are conside

says it is trying to crackdown 21 tons of aid which it tried to air drop to syrian civilians in der azzor when they attempted to drop pallets from the air after aid trucks were not able to reach the town last week because it is surrounded by i.s.i.l.-controlled territory. there's more positive news on the diplomatic front ahead of a pause due to start on saturday. rebels groups negotiations have begin and the main group the nhc has suggested it will accept the deal for two weeks. meanwhile syrian kurdish fighters, the y.p.g., say they will also abide by the cessation of hostilities. al jazeera's diplomatic editor james bays reports from new york >> reporter: at the security council there was stinging criticism of syrian regime. the u.n. humanitarian chief told ambassadors the government had delayed aid deliveries to a town and blocked until now assistance to another area. >> the number, scope and complexity of bureaucratic and other object stab ems is you a place in a path of simple aid deliveries are stagger yerg >> reporter: he had-- staggering >> earlier this morning a wfp plane droppe