Here is what I think is happining.

The world governments know about the out of control meltdown, but they cant alarm the public because the people will demand that nuclear power should be stopped, and the US and other countries could not survive without nuclear power station.

So what they will do is start a nuclear war with North Korea and blame the radiation fallout on that rather than the meldown, so the people will still see nuclear power as a viable option.

Just a thought