South Korean sources say there is growing evidence that North Korea is going to do something:  Possibly a missile test coming up, but there is also ominous activity at the North’s nuclear test site.

South Korean Unification Minister Ryoo Kihl-jae told lawmakers there are "signs" of increased activity at Punggye-ri nuclear test site similar to what preceded the nuclear blast on 12 February.  That site is close to the border with China, and Beijing was reportedly very unhappy about it.

Meanwhile, Seoul’s Director of National Security says a North Korean missile test is imminent, perhaps as soon as Wednesday.

"We're thoroughly preparing for this, leaving all possibilities open," said Kim Jang-soo, although "There are no signs of a full-scale war as of now, but the North will have to prepare for retaliation in case of any local war."

Last week, North Korea moved two missiles by rail to the east coast.  They were loaded onto mobile launchers and hidden from view.  There is some speculation that the missiles will be aimed at a trajectory that passes over Japan.

But there is also concern the missiles might not even work as intended:  Both the Musudan and KN-08 are as far as the west knows, untested.  So is North Korea’s 29-year-old leader Kim Jong-un.