Donald Trump probably thinks that:

Choices:
A. this will be good for America
B. he needs help from his staff
C. Korea could be our ally
D. not enough information
this will be good for America
SINGAPORE — North Korean leader Kim Jong Un agreed Tuesday "to complete denuclearization of the Korean Peninsula" during a historic summit with U.S. President Donald Trump, who then unexpectedly said he was suspending military drills with South Korea.
Kim's commitment to denuclearize was included in a document signed after the first-ever meeting between a sitting U.S. president and a North Korean leader.
It calls for the two countries to jointly work on efforts to build a lasting peace on the Korean Peninsula, to establish new U.S.-North Korea relations and to recover the remains of prisoners of war and military members missing in action. The two sides promised to hold follow-up negotiations.
While the document didn't lay out a specifics regarding denuclearization, Trump said at a news conference "We're starting that process very quickly. Very, very quickly, absolutely."
"We're going to denuke North Korea," Trump also told VOA contributor Greta Van Susteren, adding that U.S. troops stationed in South Korea will remain in place, but announcing one concession long-sought by North Korea not included in the document signed earlier in the day.
"We are going to get out of the war games that cost so much money," he said, referring to the U.S. participation in joint military exercises with South Korea. At his news conference, Trump said the war games were expensive, provocative and inappropriate.
​Later, a Pentagon spokesman said Defense Secretary Jim Mattis was "not surprised" by Trump's concession ending the war games and had been consulted, including discussions with Trump and Secretary of State Mike Pompeo.
"We welcome the outcomes," the defense spokesman said. "We support them."
Trump struck an optimistic tone about his talks with Kim. "My meeting with Chairman Kim was honest, direct and productive. We got to know each other well in a very confined period of time."
The U.S. leader stressed that existing U.S. sanctions will remain in place until North Korean nuclear weapons "are no longer a factor."