Way back in the 1950's the Korean War ended with a truce. There was no peace treaty. North Korea and China would not sign one.
Since then, many presidents have tried for a peace accord. The first was Truman. Then Eisenhower. Then Kennedy. Then Johnson. Then Nixon. Then Ford. Then Carter. Then Reagan. Then Bush the First. Then Clinton. Then Bush the Second. Then Obama.
Now we have the novice who doesn't understand foreign policy, Trump. And it begins to look like we may get a peace treaty.