The United States shouldn't grant a peace treaty to North Korea as an incentive to denuclearize. Denuclearization and verification should come first.
Remember, it would be a win for North Korea if the US-South Korean alliance is weakened before the talks fail and North Korea resumes nuclear work.
And recall that until a peace treaty is signed, the North Korea issue is still formally under the United Nations' interests which authorized the war to defend South Kore in the first place. North Korea would love to have the UN role (which magnifies our efforts to resist North Korea) eliminated.
You can be sure that Russia and China would veto any effort to get the UN involved again if North Korea's effort succeeds and North Korea resumes nuclear work.
Maximum pressure on North Korea until they get rid of their nukes and verify that status must not relax the pressure in this key area.