This is a good article on that in a nutshell: http://www.pewglobal.org/2016/09/13/hostile-neighbors-china-vs-japan/ http://www.pewglobal.org/2016/09/13/hostile-

This is a good article on that in a nutshell: http://www.pewglobal.org/2016/09/13/hostile-neighbors-china-vs-japan/ http://www.pewglobal.org/2016/09/13/hostile-neighbors-china-... Lots of things have been happening between the two countries for a while now, not since 2011. As others have said, there is a territorial dispute that to the best of my knowledge really flared up when Japan actively nationalized the Senkaku/Diaoyu Islands. China's moves in the South China Sea have not made things better. Aside from that, China blocked rare earth minerals to Japan in 2010. [1] There have been numerous boycotts by China (to the point of outright vandalism of Japanese cars, business property) over political issues [2] There is always the whole WW2 apology issue (over comfort women, wartime crimes, etc.) In 2015, China made a jab at Japan during their 70th anniversary of WW2 victory. [3] On the bright side, China did help Japan out during the big earthquake/tsunami of 2011. [4] [1] http://www.eastasiaforum.org/2013/08/18/did-china-really-ban-rare-earth-metals-exports-to-japan/ http://www.eastasiaforum.org/2013/08/18/did-china-really-ban... [2] http://www.businessinsider.com/chinese-boycott-hurts-japan-2012-9 http://www.businessinsider.com/chinese-boycott-hurts-japan-2... [3] http://www.businessinsider.com/chinese-boycott-hurts-japan-2012-9 http://www.businessinsider.com/chinese-boycott-hurts-japan-2... [4] http://www.npr.org/2011/03/15/134567659/china-acts-fast-in-aiding-japan-post-earthquake http://www.npr.org/2011/03/15/134567659/china-acts-fast-in-a...