After initially deciding to embrace Huawei, Britain has completely changed course. The United Kingdom will further restrict and even block China’s Huawei telecommunications firm, in fact a front for a signal intelligence operation, from building out its 5G network.

Speaking on Monday, a government minister confirmed that GCHQ, Britain’s equivalent of the NSA, has delivered a new report on Huawei’s viability as a security-compatible 5G vendor. This follows the introduction of U.S. sanctions on Huawei and reflects fears that those sanctions will force Huawei to use less secure hardware. As widely reported, GCHQ’s report warns that the sanctions and Huawei’s unwillingness to address other security concerns mean its inclusion in Britain’s 5G network is now high risk. Prime Minister Boris Johnson will likely use this report as an excuse to block Huawei’s access.