It seems world powers may find it difficult to implement a ceasefire in Syria as rebel groups in the country have vowed to continue fighting because they do not believe that Russia will end its bombing campaign in support of the government.
The rebels also expressed doubt over a deal by world powers to push for a cessation of hostilities within a week.
They have also reiterated their demand that President Bashar Al-Assad be removed from power.
But the President is still talking tough as he has vowed to retake “the whole country” from rebels.
On Thursday, world powers reached an agreement in Germany to try to bring about a cessation of hostilities and allow more access for humanitarian aid , but neither the Syrian Government nor the rebels were involved.
A new UN Task Force set up to co-ordinate aid distributions convened in Geneva on Friday.
Some Syrian cities had been cut off from aid for more than a year because of fighting. About 13.5 million people are in need, the UN said.
The US State Department spokesman, Mark Toner, said that Mr Assad was “deluded” if he thought there was a military solution to the conflict.
More than 250,000 people had been killed and about 11 million displaced in almost five years of fighting in Syria.