The North has test-fired more than 30 missiles this week, including an intercontinental ballistic missile on Thursday that triggered evacuation alerts in northern Japan, and flew large numbers of warplanes inside its territory in an angry reaction to a massive combined aerial exercise between the United States and South Korea.The South Korean military said two B-1B bombers trained with four U.S. F-16 fighter jets and four South Korean F-35s jets during the last day of the “Vigilant Storm” joint air force drills that wraps up Saturday.South Korea’s Joint Chiefs of Staff said the participation of the B-1Bs in the joint drills demonstrated the allies’ readiness to “sternly respond” to North Korean provocations and the U.S. commitment to defend its ally with the full range of its military capabilities, including nuclear.The South’s Joint Chiefs of Staff said the North Korean warplanes were detected in various areas inland and along the country’s eastern and western coasts, but did not come particularly close to the Koreas’ border.North Korea has launched dozens of ballistic missiles this year, including multiple ICBMs and an intermediate-range missile flown over Japan."