South Korean national security adviser in US, to meet Bolton

South Korea's national security adviser is in Washington to meet his US counterpart, John Bolton, ahead of an expected summit between US President Donald Trump and North Korean leader Kim Jong Un, officials in Washington and Seoul said.

The US National Security Council asked Chung Eui-yong to fly to the United States to discuss matters related to the summit, a South Korean presidential official told reporters on Friday.

The United States had asked that the visit be kept quiet due to the issues to be addressed at meetings there, said the official, who declined to be identified.