A top South Korean official on Friday said there was little security risk in using equipment by Chinese telecoms giant Huawei for his country’s 5G network, amid efforts by the United States to persuade allies to avoid the company.The presidential Blue House official said South Korea used Huawei hardware for less than 10 per cent of its fifth-generation cellular infrastructure, with the rest provided by Samsung and other firms.“[Huawei equipment] is clearly isolated from our defence and security…