The summit between President Trump and the leader of the Democratic People's Republic of [North] Korea Kim Jong-Un took place just last week. My understanding many of Trump's predecessors just didn't want to share the stage with any leader of North Korea giving him legitmacy. Of course with this summit Trump did just that even if recent news notes that North Korea remains a threat.
All the same the goal of this summit was simple, what does it take to get the Kim dynasty to disarm their nuclear weapons. Also note that for many years NK had been closed to the rest of the world perhaps there is an opportunity to possible open that nation up.
Just think that there have been reports over the years not only of human rights abuses perpetuated by the Kim dynasty on their own people primarily, but also of severe famine. The Korean War of 1950 to 1953 ended in an armistice with no formal peace treaty the state of war still existed between the Republic of [South] Korea and NK. A
The video above from History channel gives a brief overview of Korean history during it's time as a "Hermit Kingdom" - a name used for North Korea - through the influence of China, Japan, and Russia with a period of Japanese occupation. Then finally the split after the expulsion of Japanese forces with the end of the second World War between the community North and the democratic South which remains today.
Also an introduction to the beginnings of the Kim dynasty in the north. I never knew that Kim Song Ju changed his name to Kim Il-Sung, was raised in China and knew very little Korean. Of course his descendants remain in control of the nation from Il Sung to Kim Jong-Il and then finally Kim Jong-Un. It's a very interesting and quick history lesson.