Because China fear re-militarized and nuclear Japan, which will happen if N. Korea goes its way.
That sums it up very well. China still remembers how devastating the Japanese army was to them back in World War II.
NK's current situation seems, to this poster, very similar to the situation faced by the hostage-takers in Iran, on the day President Ronald Reagan walked up to that podium.
Except this time it's not the American president whose presense itself in office, changes the course of history.
It is Abe, who is shaking Asia today.
China analysis concludes we Americans are China's eventual enemy. This is the same sort of simplistic analysis which led to the book several years ago called "The Coming War with Japan".
In that book - the role of a rising China, was completely ignored, as the authors concluded America would inevitably fight another war with Japan.
Chinese analysis of America as its biggest threat - is falling into the same trap, in reverse.
Japan could go nuclear in a matter of weeks. Big time. Not just a couple large heavy, primative bombs - Japan could become one of the most significant nuclear powers on earth, almost immediately. They've got all the parts. Knowhow. Technology. Electronics. Launch capability. And fuel.
Literally, all that's lacking is the "go" order.
Abe is the sort of leader, who would give that order, if pressed.
China has been so busy preparing for America as the threat - they took their eyes off Japan - the country which conquered China in the last war. A war during which China, and America incidentally fought on the same side.
Japan, could become the 800 pound gorilla in the room with China. Dwarfing its neighbors, and standing toe to toe with China - presenting a far closer, and far more immovable threat than America, with our whining Democrat opposition.
Japan could present a far tougher opponent to China, than even we could.
China's leaders and people are just now realizing how serious that possibility has just become. Almost overnight.
Ronald Reagan was just inaugurated.
In Tokyo.