I was thinking before that Chinese run the market and that is why news from that region do affects bitcoin in the most negative or positive ways. Japanese also have some influence but I don't think that they control the market as there are many factors that determine price.
Big countries decisions effect price of bitcoin because people think that if they are making decisions about bitcoin certainly they thoroughly investigate it and finally gave their decision. My country has banned bitcoin and I know it is for the time being but it will take long time that the government legalizes bitcoin in my country. China has banned bitcoin two times but now they allow their people to trade and invest in bitcoin.