Yes the RMB deval was a total fiasco that led to multiple errors (even with how they were setting the fixings in Jan 2016). That's a good example of CCP wanting but failing to control both the level and trajectory of a market asset. If you tell people you want the RMB to depreciate by 10% by the end of the year, nobody will wait for it to depreciate in a nice gradual line. Everyone will run to sell their RMB today while it's still above 90% value.

Anyhow, I'm sure we agree that 2015 wasn't an attack on global markets on purpose, but an unforced error (that also cascaded with things like crowded positions in Risk Parity funds and lack of liquidity in a few markets). I thought above you were asking whether China would attack capital markets on purpose, in order to influence the US election outcome, which I deem very very unlikely.

Whether China can accidentally affect the trajectory of global markets to the downside is another, more complicated question. They're clearly trying to control both the level and rate of their equity markets again right now, trying to create "a bull market but not a bubble".