Companies asked by Washington to use online services to spy on customers

Foreign technology services providers such as Google and Apple can become cybersecurity threats to Chinese users, security analysts said, one week after China announced that it will put in place a security review on imported technology equipment.

Other major tech companies, such as Yahoo, Cisco, Microsoft and Facebook, were required by the US National Security Agency to transfer their users' information, according to Wan Tao, founder of Intelligence Defense Friends Laboratory, an independent institution focusing on cybersecurity in China.