What does North Korea's Kim Jong-un hope to achieve with missile tests and threats?

Kim Jong-un has a long list of demands of the international community but the ultimate aim remains the crowning glory that his father and grandfather were never able to achieve: Reunification of the Korean Peninsula under North Korea's ideological philosophy. Kim Il-sung attempted a land grab in 1950 that would have given him control of the southern half of the peninsula but his troops were denied by United Nations forces after a three-year conflict.  Children in the North are still taught