SEOUL, South Korea and the United States fully agree on the need to peacefully denuclearize the Korean Peninsula, Seoul's top security adviser said Friday, returning from his surprising trip to Washington for talks with his new U.S. counterpart.

Chung Eui-yong, head of the presidential National Security Office, said he and the new U.S. National Security Adviser, John Bolton, had "very productive" discussions.

"We agreed that our two countries will do our utmost for the success of the South-North Korea summit and the North-U.S. summit," Chung told reporters shortly after arriving at Seoul's Incheon International Airport.

Chung's three-day trip to the U.S. came as South Korean President Moon Jae-in is set to hold a summit with North Korean leader Kim Jong-un on April 27. The inter-Korean summit is also set to be followed by the first-ever U.S.-North Korea summit, which is expected to be held in May or early June.

"We agreed that the countries' National Security Councils will closely consult with each other for the success of the summits," Chung said.

"In particular, I come back after confirming the fact that there are no different views between the two countries on the basic principle of establishing peace through denuclearization, which the countries must push for," he added.

Source: Yonhap News Agency