Mattohti Mattursun was one of 350 Uighur refugees, including children, who were detained in March 2014.
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Foreign minister also warns on Taiwan, Xinjiang but says countries must work with China on world’s pressing problems.
Alleged Chinese police stations overseas raise concerns Beijing is formalising surveillance far beyond its borders.
The US president’s highlighting of the Uighurs comes at a time of strong tension between Washington and Beijing.
