North Korea's statement in response to unilateral UN sanctions after their nuclear tests is pretty downright scary, particularly this bit:
We will fulfil our duty to denuclearize the Korean peninsula as we have already declared, but if anyone tries to infringe on our sovereignty and our right to existence, even a bit, under the signboard of the UN Security Council resolution, we will unsparingly launch a merciless strike. We will watch out for any move by the United States, and will take appropriate measures accordingly.
What constitutes infringing on their sovereignty just "even a bit"? Taunting Kim Jong-il from across the river in full view of the guards on the border between China and N.Korea? Actually, it'd be difficult for the guards to see you as they'll be in darkness, judging from this article.
Indeed, while Kim Jong-il parties away with his cognac, and bottles of wine that cost more than what a North Korean worker makes in a year, his country only has a couple of hours of electricity a day. The contrasts from space with South Korea and Japan are pretty telling when you look at this composite picture of the Earth at night from space, as well as the close-up image above.