When Intel CEO Brian Krzanich flew into Beijing last October to tie down an investment in Tsinghua Unigroup, a Chinese chip maker, Unigroup CEO Zhao Weiguo whisked him into a meeting at China's Ministry of Industry and Information Technology , where a vice minister blessed the deal. On Tuesday, following reports that Unigroup was preparing to launch the biggest Chinese takeover bid of a U.S. company, Zhao could not be reached for comment.