South Korea offered to hold high-level talks with North Korea this week after North Korean leader Kim Jong Un said he was open to negotiations as his country aims to strengthen its nuclear weapons programme.
"The North Koreans are behaving out of fear, that is they are very concerned that America for the first time in an awfully long time is serious about denuclearizing the peninsula," Pompeo was quoted by Fox News.
"We'll just have to wait and see how the conversations going Tuesday," he said, referring to the scheduled talks between the North Korea and South Korea.
North Koreans, he said, are in a tough spot.
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"President Trump has made very clear that the US policy is denuclearisation of the peninsula and that we are going to achieve that," he said.
"So, the North Koreans doing what they have historically done, reaching out, trying to find space, trying to come up for air when they are being strangled by a president who's made very clear that their behavior is unacceptable. This his is certainly part of that," he said.