“Actually, I think that in coming months, in fact, the fighting is going to increase massively, and we will probably see even more massacres, just because there is a sense right now that there is no outside help coming, so it’s a free-for-all,” Hokayem said.

And that would make it more difficult for United Nations inspectors to find and destroy or transport Syria’s chemical weapons. Still, if Russia restrains Syrian government forces and the West convinces the rebels not to interfere with the inspectors, U.N. Secretary-General Ban Ki-moon thinks the plan could work.

"Both sides who have influence on government forces and opposition forces could influence political pressure or whatever. I think that can be done. Yes," admitted Ban.

That will be tested this week, as a team of inspectors arrives in Syria. And experts are not convinced that cooperation will be a priority for neither the government nor the rebels.