U.S. Secretary of State Mike Pompeo said after the summit between President Donald Trump and Kim Jong Un that North Korea has been offered with a “remarkable” security deal with guarantees that will go even further than the 2005 agreement.

The 2005 agreement called for North Korea to end its nuclear weapons program in return for security, economic and energy benefits, potentially easing tensions with the United States after a two-year standoff over the North’s efforts to build atomic bombs.

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On Tuesday, in the signed agreement between the countries, Trump “committed to provide security guarantees” to North Korea and Kim “reaffirmed his firm and unwavering commitment to complete denuclearization of the Korean Peninsula.” Also, Pompeo and a high-level North Korean official agreed to hold “follow-on negotiations at the earliest possible date to implement the outcomes” of the summit meeting.

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“Working together, we will get it taken care of,” Trump said. “We will solve a big problem, a big dilemma that until this point has been unable to be solved.” Kim responded vaguely, “There will be challenges ahead, but we will work with Trump.”

In order to close the gap between U.S. and North Korea, Trump has given Kim more assurances of security. Pompeo told reporters on Monday, “It is the case we are prepared to give security assurances necessary for the North Koreans to engage in … denuclearisation. We are prepared to take actions that will provide them sufficient certainty that they can be comfortable that denuclearisation isn’t something that ends badly for them.” He added, “We are prepared to make … security assurances that are different, [more] unique than, what America has been willing to provide previously. We think this is both necessary and appropriate.”

Pompeo was optimistic about the deal’s prospects, though expectations on both side are widely different. North Korea expects a gradual rapprochement on both sides with the distant goal of nuclear disarmament. The Trump Administration, on the other hand, insists on “full, verifiable, irreversible disarmament” of North Korea, with a focus on unilateral action in North Korea. These would be rewarded with security guarantees from the U.S.

On Monday, Pompeo tweeted: