US President Donald Trump's appointment of Mr John Bolton as national security adviser is probably the most controversial such appointment in a generation.
Commentators have voiced fears that Mr Bolton would drag the United States into war. He has advocated a pre-emptive strike against North Korea and may well push for the US to abandon the "one-China policy" and support the independence-leaning faction in Taiwan. This could cross one of China's "red lines" and drag the US into any ensuing conflict.
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