WND.com: "China: 'Pervasive access' to 80% of telecoms"
The Chinese government has “pervasive access” to some 80 percent of the world’s communications, giving it the ability to undertake remote industrial espionage and even sabotage electronically of critical infrastructures in the United States and in other industrialized countries.
Several allegations against Huawei, including that in return for massive Chinese government subsidies it's building backdoors into its routing equipment. Apparently they've also gotten Deep Packet Inspection tech working fairly solidly. Good way for any country to control what services are allowed to operate on its networks. "Twitter Revolution"? *throws switch* "What Twitter Revolution?"