The Pentagon has added several prominent Chinese businesses, including tech giant Alibaba, electric car maker BYD and search engine Baidu, to its list of Chinese military companies, preventing them from getting US defense contracts. The list, updated and published Monday by the Pentagon, now sanctions well-known, non-state-owned Chinese companies that are not traditionally considered to be in the defense or security sector. It reflects growing wariness of Beijing's strategy of tapping the strength of non-state businesses for military purposes.