The cancellation is seen as a significant concession to North Korea.
Although human rights was not included in the joint statement signed by Trump and Kim, the United States president said he raised the issue and he believed the North Korean leader wanted to "do the right thing". "No more rocket launches, nuclear testing or research!" he also tweeted.
For good measure, Trump again called Xi a close friend and thanked him for China's role in strengthening sanctions against North Korea. The statement made clear that Pyongyang was expecting USA concessions before any moves by the North.
Trump agreed to end joint U.S.
Earlier, South Korea's Presidential Blue House said it needed "to find out the precise meaning or intentions" of Mr Trump's statement. -North Korea relations, and to recover the remains of prisoners of war and military members missing in action.
There was little else mention of denuclearization of North Korea in the statement, which mainly focused on stopping hostilities between North Korea and the United States. "South Korean alliance", said Moon Seong-mook, a former South Korean military official and current head of the Unification Strategy Center in Seoul.
"We would like to seek an understanding of this between Japan, the USA and South Korea", Japan's defence minister, Itsunori Onodera, said.
She said the global community was at the beginning of a very long process: "The detail is still to be worked through". Ultimately, Trump has just willingly sat down with a villain and not gained much in the way of concessions in return.
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"We would like to seek an understanding of this between Japan, the USA and South Korea", Onodera was quoted as saying. The video offered Kim a stark choice between military conflict on the Korean Peninsula and the kind of robust economic development that has turned neighbouring South Korea into a wealthy nation.
"Trump, he has to make the agenda on the table about North Korean human rights", he said in a telephone interview.
"U.S. gives up one of our biggest negotiating chips - military exercises", Sen.
"I think he loved it", the president said.
The agreement said the two countries would co-operate towards "new relations", while the U.S. would provide "security guarantees" to North Korea.
Cheered on by crowds of onlookers, Kim toured the Marina Bay Sands, a three-tower complex with the replica of a cruise ship spanning across the 57th floors, strolled along the architecturally stunning Jubilee Bridge and took a selfie with Singapore's foreign minister. He spoke before Trump and Wang announced the USA was suspending the military drills. "China of course supports it". "Because this is the goal we have hoped for and have been working for". Pyongyang has advocated for decades for a peace treaty to formally end the Korean War, rather than the armistice that has been in place for more than 60 years. Any instability - or alternatively, a deal that leads to a US -aligned unified Korea - potentially could put American troops on its border.
At the truce village that divides the two Koreas, North Korean soldiers expressed enthusiasm for yesterday's Trump-Kim meeting.
But the ministry was quick to raise India's concerns over the North Korea-Pakistan axis.
-With assistance from Kanga Kong and Andy Sharp.