US President Donald Trump agreed with South Korean President Moon Jae-in to revise the two countries' treaty capping the development of the South's ballistic missiles as Seoul has hoped. Moon's office today said that South Korea's development of its ballistic missiles is limited to range of 800 kilometres and payload weight of 500 kilograms under a bilateral treaty revised in 2012.<br/>' <br/>South Korea's Blue House said in a telephone call that the two leaders discussed the issue as a way to boost the South's defense against growing threat from North.