What a horrible deal this would have been if President Trump would have agreed to it:

 U.S. President Donald Trump has said that North Korean leader Kim Jong-un wanted to remove only one or two of the five nuclear sites in his country during their summit in Hanoi in February.
Trump made remarks in an interview with Fox News on Sunday (Washington time), reiterating his vow not to allow Iran to have nuclear arms amid heightened military tensions with the Islamic republic.
“When I left Vietnam where we had the summit, I said to Chairman Kim … And I think very importantly I said, look, you are not ready for a deal because he wanted to get rid of one or two sites,” Trump said. 
“But he has five sites … I said what about the other three sites. That is no good,” he added.
The Hanoi summit collapsed as Trump and Kim failed to bridge their gaps over the scope of Pyongyang’s denuclearization and Washington’s sanctions relief. Since then, the bilateral negotiations have hit an impasse.
Trump, however, highlighted that there have not been nuclear and long-range tests amid his administration’s diplomatic efforts.
“They haven’t had any tests over the last two years. It is zero,” he said. 

Yonhap

You can read more at the link, but I think President Trump should not be bragging too much about the missile and nuclear test moratorium. The self imposed moratorium Kim Jong-un has already said will end next year if a deal is not struck, just in time for the Presidential election season.