It looks like the capitulation to Kim Jong-un’s demands is being considered by the Trump administration:

The U.S. government is willing to lift some economic sanctions on North Korea if the regime demonstrates “sincere measures” toward denuclearization, a source with knowledge of Pyongyang-Washington talks exclusively told the JoongAng Ilbo on Tuesday.
The source, who spoke on the condition of anonymity, said he wasn’t specifically told whether that meant the United States was willing to ease its own unilateral sanctions on the North or give sanctions exemptions to third countries, including South Korea, to carry out joint projects with Pyongyang.
The United States, one of five veto-wielding members in the United Nations Security Council, has a crucial say in UN sanctions on the North. Unanimous approval from a UN North Korean sanctions committee composed of the five countries – the United States, Britain, Russia, China and France – and 10 nonpermanent members on the UN Security Council is normally required for a sanctions waiver.
If the former hypothesis is true, it would mean Washington is willing to ease sanctions even before North Korean carries out total denuclearization, which goes against the long-held mantra of the White House that sanctions will not be eased before the North’s final, fully verified denuclearization, or FFVD.
The source told the paper that Washington’s definition of “sincere measures” from the North included a partial inventory of its nuclear weapons and facilities or allowing outside experts to inspect the Yongbyon nuclear plant. [Joong Ang Ilbo]