China launched military drills around Taiwan on Saturday, the day after Taiwan Vice President William Lai returned to Taipei after making two stopovers in the United States as part of a trip to Paraguay, angering China which views him as a separatist and a "troublemaker". Here are the key issues in Taiwan-U.S., China-U.S. and Taiwan-China relations, and why China is so upset about Lai's visit to the United States.
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