The United States is ramping up efforts to strengthen South Korea's military. On the second leg of U.S. President Donald Trump's Asia-Pacific tour, South Korea and the United States announced an agreement to eliminate the payload limit on South Korean ballistic missiles. The limitations had been put in place largely because of U.S. concerns over missile proliferation, but have been slowly lifted following South Korea's entrance into the Missile Technology Control Regime agreement in 2001. North Korea's intercontinental ballistic missile test in July then sparked fresh talks on revising the limits....