TOKYO—The U.S. is making it tougher for American companies to help China roll out superfast cellular networks. But companies in Japan, a U.S. ally, are fueling China’s leap ahead and making money doing it. By the end of the year, China plans to deploy more than a half-million base stations in its $150 billion push to blanket the nation with fifth-generation cellular service, often with equipment from national champion Huawei Technologies Co....

Source: Wall Street Journal June 29, 2020 10:07 UTC