Taipei:US Health and Human Services Secretary Alex Azar's visit to Taipei came amid mounting tensions between Washington and Beijing, which claims Taiwan as its own territory to be annexed by force if necessary.
From the South China Sea to TikTok, Hong Kong and trade, China and the US find themselves at loggerheads just three months ahead of the American presidential election. In a throwback to the Cold War, the two ordered tit-for-tat closures of consulates in Houston and Chengdu and rhetorical sniping has become a daily occurrence.
Washington likely exacerbated those frictions by sending Azar to Taiwan, making him the highest-level US official to visit the self-governing island since formal diplomatic relations were severed in 1979 in deference to China.
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Beijing has been ratcheting up pressure on Taiwan, but that's just one area in which its increasingly assertive foreign policy and the accompanying push-back from Washington have taxed diplomacy on both sides.
Washington drew Beijing's ire last month when it parted with years of ambiguity by explicitly denying most of China's maritime claims in the strategically vital South China Sea. China says it owns the waterway and that activity in the area by the U.S. Navy, including sailing ships close to Chinese-controlled islands, threatens regional peace and stability.
Other disputes center on economic and human rights issues.
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A two-year-old tariff war has buttressed US actions targeting Chinese institutions and officials. Washington has been campaigning to exclude Chinese telecoms giant Huawei from the US and its allies, a push China sees as a bare-knuckled attempt to restrain its development as a global technology power.
The US said that Huawei is beholden to China's ruling Communist Party and threatens to compromise personal data and the integrity of the information systems in the companies in which it operates. China says there is no proof of that.
President Donald Trump stepped-up the technology confrontation last week with an executive order banning dealings with the Chinese owners of consumer apps TikTok and WeChat, possibly leading to their becoming unavailable in the lucrative U.S. market.
The US has sanctioned Chinese companies and officials over the alleged persecution of Muslims in the northwestern region of Xinjiang and has now turned its eye toward stricter Chinese control in Hong Kong.
As Azar was preparing to meet with Taiwanese President Tsai Ing-wen on Monday, Hong Kong police arrested newspaper publisher and leading opposition figure Jimmy Lai as part of a crackdown on voices questioning Beijing's policies toward the former British colony, now a semi-autonomous Chinese city.
Washington has moved to withdraw trading and other privileges granted to Hong Kong in response to China's imposition of a sweeping national security law seen as an attack on free speech and political activism. China has denounced such actions as infringing on its domestic political affairs and Beijing-backed officials sanctioned by Washington, including the city's leader Carrie Lam, appeared over the weekend to laugh-off the penalties.