For example , Seoul no longer sees any evidence of North Korea 's crimes : the government tries to keep South Korean newscasts from showing a smuggled tape of the public execution of '' criminals '' by the North that has been broadcast in Japan and elsewhere ; reports that China is shipping refugees back to North Korea are denied by the Roh government ; the North 's testing of chemical weapons on live prisoners goes largely unmentioned ; and even Pyongyang 's apparent preparations for nuclear weapons tests are played down .