The weakening of the Chinese RMB seems to have spooked the yen and by extension the Nikkei in an already nervous and shell-shocked market that's worried about dynamics both economic and geopolitical, in these last couple of days the yen has moved in a way that chartists have called a break from the weakening trend of Abenomics that we've seen for the past few years, and in that kind of environment the market becomes incredibly vulnerable to events like the RMB failing to stabilize.