A month-and-a-half after winning a snap election, Moon is still trying to form his cabinet. The left-leaning Moon, elected in May after his predecessor, the conservative Park Geun-hye, was ousted for corruption, has always been an advocate for dialogue with North Korea. On Pyongyang's nuclear ambitions - President Moon advocates engagement.
The Trump administration calls North Korea's growing weapons capabilities its top foreign policy priority - and will try to make more headway on the issue with its partner, South Korea, which relies on some 28,000 USA troops for defense.
President Moon Jae-in addresses the media aboard the flight to Washington DC on Wednesday. While US exports to South Korea started increasing at the beginning of the year, "there is still a large gap", he said. "This is the official position of the South and the U.S".
He also described the so-called "nuclear freeze" as the fundamental pre-condition for negotiations, adding that "the exit of the dialog is a complete nuclear dismantlement". The official, however, predicted "a friendly and frank discussion about the trade relationship".More news: It's difficult to recognize America in the new health care bill
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The Trump administration wants to bring Kim to the negotiating table but with preconditions.
"The ironclad alliance between the United States and the Republic of Korea has remained strong", he said.
South Korea's president has sat down with congressional leaders before holding his first meeting with President Donald Trump.
Listen closely to what USA officials like to say about America's long security alliance with South Korea, where 28,000 US troops are stationed in bases around the country. Moon campaigned on taking a more conciliatory tone in dealing with North Korea and earlier this month officially suspended deployment of the Terminal High Altitude Area Defense system, or Thaad.
The North, now under a raft of crippling United Nations sanctions over its military programs, says it will continue them until the U.S. ends its hostility toward the country.