The Biden administration has banned approvals of new telecommunications equipment from China's Huawei Technologies and ZTE because they pose "an unacceptable risk" to U.S. national security. The U.S. Federal Communications Commission said on Friday it had adopted the final rules, which also bar the sale or import of equipment made by Chinese surveillance equipment maker Dahua Technology Co, video surveillance firm Hangzhou Hikvision Digital Technology Co Ltd and telecoms firm Hytera Communications Corp Ltd. The move represents Washington's latest crackdown on the Chinese tech giants amid fears that Beijing could use them to spy on Americans. "These new rules are…