In response toescalating threats from Kim Jong Un, the United States and South Korea started a large-scale military exercise that is expected to anger North Korea. What Happened: The annual military exercises, which began on Monday, aim to enhance preparedness against North Korean nuclear threats. The drills include a computer-simulated command post training called the Freedom Shield exercise and various field exercises, the South Korean Defense Ministry announced, AP News reported. North Korea, which views these drills as a rehearsal for invasion, has not yet responded. The country has previo…