I am talking about action of a single agent - the Chinese government. Its role is very different than running for security. China is trying to manage the stock market (pretty desperately) for quite a while already. This year is also special for their AIIB leadership. The chronology, causation of international agreements, yuan swings, stock markets, wretched measures is not clear. There are speculative talks on internet tubes that the Chinese stock markets are attacked for "reserve currency threats" (and even this).