One recent study by AMR Research has found that U.S. and China have the highest level of supply chain risk in global supply chains.

Unfortunately I haven't read the report and just saw the press release by a PR firm but that doesn't surprise me that much. I think if you compare U.S. to Europe for example, the number of natural disasters, transport accidents and these sort of things are much higher in the U.S. than in Europe. Also the great distance with China and possibility of EH&S related issues adds to the vulnerability dimension of the supply chain for multi-nationals

In these conditions, Middle-east seems still safer despite of current political tensions...:)