Taipei/Hong Kong CNN —Taiwan is investigating whether four of its firms broke US sanctions or its own investment rules when they provided services to Chinese companies that are reportedly helping Huawei build chip factories. Many Taiwanese companies, including chip giant TSMC and Apple supplier Foxconn, operate in China and are closely integrated into its supply chains. For years, Taiwan’s companies have been treading a fine line between engaging China’s commercial opportunities and avoiding potential violations of export controls, particularly as Beijing has ramped up military pressure on the island. But China’s ruling Communist Party claims Taiwan, home to 24 million residents, as its territory — despite never having controlled it. It has long vowed to “reunify” Taiwan with the Chinese mainland, by force if necessary.

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Persons: Emile Chang, ”, Chang, Economic Affairs Wang Mei, Wang, China’s, “ Organizations: Hong Kong CNN, Huawei, Ministry of Economic Affairs, CNN, United Integrated Services, K Engineering, Technology, Apple, Foxconn, Taiwan’s, Economic Affairs, Bloomberg, Communist Party Locations: Taipei, Hong Kong, Taiwan, China, United States, China . Washington, Europe, Asia, Beijing