US Secretary of State for Political and Military Affairs, Clark Cooper, stressed South Korea's attitude change, citing that the United States was flexible with regard to delays in negotiating a deal with the United States.

"The negotiations haven't actually stopped," Cooper said in a video press briefing with foreign journalists asking about the progress of the negotiations after the United States reproposed $ 1.3 billion last month in South Korea.

"Every party has continued to communicate on multiple lines," he said. "As we progressed through the negotiations, we saw that we were very flexible about our own coordination."

He also explained, "The conversation between Seoul and Washington and the Ministry of Foreign Affairs is a 'going and going debate.'

It is believed that the U.S. originally reiterated its claim that it was flexible to lower demand from $ 5 billion to $ 1.3 billion today.

"It is recognized that there is still a need to reach a point where both governments are fully accommodating, and that President Moon Jae-in and President Donald Trump are sufficiently accommodating," he said. "We will continue to work on this."