North Korea’s Foreign Ministry criticized the United States for expanding joint military exercises with South Korea that it claims are practice for a potential invasion, and it warned Tuesday of “more powerful follow-up measures” in response…The statement from the ministry came as the U.S. and South Korea conduct aerial drills involving more than 200 warplanes, including their advanced F-35 fighter jets, as they step up their defense posture in the face of North Korea’s increased weapons testing and growing nuclear threat.