The U.S.is set to give North Korea a specific timeline to complete denuclearization, while outlining specific requests.
The North has long accused the USA of provoking the 1950-53 Korean War as part of a plan for global domination and blames it for the division of the peninsula, agreed between Moscow and Washington in the closing days of World War II.
In another sign of detente following the summit between leader Kim Jong-un and President Trump, North Korea has chose to skip one of the most symbolic and politically charged events of its calendar: the annual "anti-US imperialism" rally marking the start of the Korean War.
A 42-minute documentary-style news special was aired on the state television network two days after the summit and has been repeated frequently since, meaning that by now there are probably few North Koreans who are unaware of the changes in the air. "We hope that we will have an ongoing process of making progress".
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The joint statement between Trump and Kim laid out broad principles about North Korea's commitment to denuclearize, but was short on specifics on how and when that would happen, or how Pyongyang would be rewarded by the United States for doing so.
Pompeo told CNN that instead he would "assess" the North Korean regime's promise to take steps toward "complete denuclearization" as the United States has suspended military drills on the peninsula.
"If we can't do that, if it turns out that there is no capacity to deliver the outcome that both presidents said they wanted, yeah, we reassess", he said.
Mattis, at the start of a week-long trip that includes stops in China, South Korea and Japan, said Trump's guidance on suspending military drills applied not just to the major Freedom Guardian exercise in August but also to two smaller Korean Marine Exchange Program training exercises.
Pompeo said a week ago he was likely to travel back to North Korea "before too terribly long" to try to flesh out commitments made at the summit.
This weekend the Pentagon announced the formal suspension of major joint military exercises with South Korea, but said in a statement that "additional decisions will depend upon the DPRK continuing to have productive negotiations in good faith" with Pompeo.