CLAREMONT, CALIFORNIA — The United Kingdom’s decision to ban Huawei from its 5G networks has dealt a painful blow to China. Until recently, China was still counting on the U.K. to stick to its earlier decision to allow the Chinese telecom giant to supply non-core equipment for the country’s 5G networks. But two recent developments made such a decision untenable. The first was the United States’ escalation of its war on Huawei. The U.S. instituted a new sanction in May banning supplier