TOKYO — The U.S. and South Korean air forces Monday began a huge combat exercise that will include simulated strikes on mock North Korean nuclear and missile targets. North Korea denounced the exercises as dangerous “when insane President Trump is running wild,” while analysts warned that they sharply increase the chances of miscalculation and accidental conflict. More than 230 warplanes — including six U.S. Air Force F-22 Raptors and another six F-35A stealth fighters deployed to the peninsula especially for the exercises — are taking part.  Two B-1B Lancer bombers are also expected to participate in the five-day-long drills, called “Vigilant ACE,” along with about 12,000 American troops, including Navy and Marine Corps personnel. The “realistic air combat exercise” is designed to enhance coordination between the United States and South Korea and increase the allies’ combat effectiveness, the U.S. 7th Air Force said in a statement. They will practice for a range of wartime scenarios, including enemy infiltration drills and precision strikes on mock North Korean nuclear and missile targets, the statement added. The drills will take place in all weather, both day and night, so the forces are ready for any situation, South Korea’s Defense Ministry said.  However, the drills got off to an inauspicious start when one of the Raptors touched down at a South Korean base in Gwangju on Monday morning but then could not move and had to be towed, a South Korean official told the Stars and Stripes newspaper. The Yonhap News Agency published photos of an F-22 being towed. [ North Korea has shown us its new missile, and it’s scarier than we thought ] The third annual drills were scheduled long before the recent increase in tensions between North Korea and the outside world, and they are comparable in size to those in previous years, although fifth-generation stealth jets are involved for the first time this year. Still, the environment could hardly be more tense. After detonating a hydrogen bomb in September, North Korea last week launched its most advanced intercontinental ballistic missile yet, one that puts all of the United States within range. Kim Jong Un’s regime