Harris previously led the U.S. Pacific Command and spent 40 years in the Navy. The Koreas in December 2007 began freight services between South Korea's Munsan Station in Paju and North Korea's Pongdong Station, which is near the border town of Kaesong.
Secretary of State Mike Pompeo said Wednesday that North Korea remains a nuclear threat, but defended Trump's previous comment.
At a historic summit in Singapore earlier this month, U.S. President Donald Trump and North Korean leader Kim Jong-un agreed to the "complete denuclearization" of the Korean Peninsula in exchange for security guarantees from the U.S.
In an apparent sign of goodwill before the Trump-Kim summit, North Korea in May claimed it demolished a separate nuclear test site at Punggye-ri, which sits in a sparsely populated mountainous region in the country's northeast.
When news first broke earlier this year that Harris would be nominated for the post in Seoul, South Korean media described him as a hawk on North Korea, taking cue from his remarks during a 2014 Senate confirmation hearing for his admiral post that the North was America's "most volatile and risky threat". "I think his point was a fair one".
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Shortly after the summit, Harris told the Senate Foreign Relations Committee that the United States should suspend major military exercises with South Korea "to see if Kim Jong-un is in fact serious about his part of the negotiations".
"They're watching this hearing", Pompeo added, apparently referring to North Korean officials. Survival is highly dependent on China, and sanctions to counter North Korea's nuclear threat have put further pressure on the economy.
Trump and Kim met in Singapore on June 12. "Yongbyon Nuclear Scientific Research Center are continuing at a rapid pace", it said.
He said the best way to repay the veterans is to build a Korean Peninsula of peace, stressing that peace is the way to truly honor the fallen heroes. "There is little indication that North Korea has halted research, development, or production of nuclear systems even as talks continue", he added.
"We should remain skeptical that North Korea's nuclear calculus has changed dramatically".