The most fundamental difference appears to relate to the basic premise of the deal: Does North Korea give up nuclear weapons first, in exchange for a better relationship? Or is this a process that will play out step by step?
The Trump administration had previously ruled out a step-by-step approach. In May, Pompeo told reporters, "We are not going to do this in small increments, where the world is essentially coerced into relieving economic pressure." President Trump seemed to agree, saying Tuesday that Kim would begin "de-nuking" North Korea "very quickly."
The problem is that the North Korean account said the opposite — that Trump had agreed to a "step-by-step" process in which the United States would "offer security guarantees to the DPRK and lift sanctions against it..."
https://www.npr.org/2018/06/14/61988...-apart-as-ever