This is the best tl;dr I could make, original reduced by 81%. (I'm a bot)

> "No matter [whether] it is Taiwan leaders coming to the United States or the US. leaders visiting Taiwan could lead to another serious, serious, serious confrontation in the China-US relationship," said Xu Xueyuan, China's Chargé d'Affaires in a press conference.

> China's Ministry of Foreign Affairs and Taiwan Affairs Office have also strongly condemned the visit, charging that it violates the "One China" principle, whereby China insists Taiwan is an inalienable part of its territory to be reunified one day.

> Why do China and Taiwan have poor relations? China sees the self-ruled island as a part of its territory and insists it should be unified with the mainland, by force if necessary.

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