UK's Johnson announces 'diplomatic boycott' of Beijing Olympics
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Johnson said he typically did not support "sporting boycotts", but revealed there were no plans for government ministers to attend the games over alleged human rights abuses by China.
"I do not think that sporting boycotts are sensible -- that remains the policy of the government," he added.
The allies have a growing discord with China over a slew of issues that has plunged relations into the most serious crisis since the Tiananmen Square crackdown in 1989.
They include human rights abuses in Xinjiang and a crackdown on pro-democracy groups in Hong Kong, a former British colony returned to Chinese rule in 1997.