North Korea is a grotesque among nations, reminding the Western observer more of dystopian, cautionary literature more than a nation-state in the modern era. It has a theocracy founded on a religion invented by its reigning family, it has profound poverty, it is militant and provocative in a way that overshadows even Iran. Especially recently this is the case, with North Korea making nuclear threats against its neighbor and the United States which we know are backed up with at least some know-how. It engages in such bizarro control measures to keep its population as isolated as possible from the rest of the world.
It couldn't be more clear to most why it is a country of focus for the international community.