Huawei Technologies Co Ltd , the Chinese company put on a U.S. black list because of national security concerns, secretly helped North Korea build and maintain its commercial wireless network, the Washington Post reported on Monday, citing sources and internal documents. The Chinese telecommunications giant partnered with a state-owned Chinese firm, Panda International Information Technology Co Ltd., on a number of projects in North Korea over at least eight years, the Post reported. Such a move would raise questions of whether Huawei, which has used U.S. technology in its ...