Another lie. China's most famous supercomputer (Dawning 4000A) does not use Red Flag Linux. It uses a Chinese-customized version of Turbolinux. Yes, Turbolinux, the Japanese company, which has been making lots of money in China. To date, I haven't heard of Red Flag on a supercomputer, as the distro just isn't made for that purpose.
BTW, they teamed with AMD on it, and used proprietary Myrinet interconnect technology. An easy way to hurt foreign clusters is to restrict the sales of the interconnects, as without them it's just a bunch of computers that can't communicate well. The OS isn't anywhere near as important.
I know, it's the clustering they get from NASA, all for free thanks to the current rules. Why do you back them, again?