China’s defence minister has not been seen in almost three weeks with speculation he is under investigation, the latest case of a senior Communist party official to disappear from public view. General Li Shangfu was last seen on 29 August when he gave a speech to the China-Africa peace and security forum. His last overseas trip was to Moscow and Minsk in mid-August, where he met Russian officials on the sidelines of a security conference, and with Belarusian president Alexander Lukashenko. The US government believes Li has been put under investigation, the Financial Times reported on Friday, citing senior officials….