A hot potato: The US / China tech clash is entering an even more heated phase, with the FCC acting as a hammer against Chinese companies making network and telecom devices. They're an unacceptable risk to national security, the FCC claims. The Federal Communications Commission (FCC) has decided to effectively ban the sale and importation of telecom products made by five Chinese tech companies. The "no sale" list includes Huawei, ZTE, Hytera Communications, Hikvision and Dahua, and according to FCC commissioners it would shield the US from the "unacceptable risks to national security" posed by the aforementioned product makers. The…