India, Jan. 26 -- China's senior-most general, second in the pecking order only to President Xi Jinping, has become the subject of an investigation as the country's most powerful leader continues his purge of military officials suspected of graft or disloyalty. A statement from China's defence ministry only said that General Zhang Youxia, a vice chairman of the Central Military Commission (CMC) that controls the armed forces - and a childhood friend of Xi - was being investigated for "grave violations" of discipline and the law. Leaks to the media suggest Zhang is accused of sharing technical information on China's nuclear weapons programme with the US, building his circle of influence within the CMC, and accepting bribes for official act...