Kim Jong-un is the Supreme Leader of North Korea, having taken power in December 2011 after the death of his father, Kim Jong-il. He is known for his authoritarian rule and has focused on developing the country's nuclear weapons program, which has drawn international criticism and sanctions. Under Kim Jong-un's leadership, North Korea has experienced significant military advancements, including missile tests. He has also engaged in diplomatic efforts, including summits with South Korea and the United States, aimed at reducing tensions on the Korean Peninsula.