Trump said the USA will save huge amounts of money by halting "inappropriate" military exercises with South Korea.
Kim Jong Un appeared upbeat at the prospects for peace on the peninsula after the summit. "But we're giving him a chance to survive again after we did so with Kim Jong-il", wrote another, referring to previous peace overtures to the North Korean leader's father.
Professor John Hajek from the University of Melbourne's School of Languages and Linguistics said the US President was "doing all the talking" and had the "upper hand" when the two met for their historic meeting.
While the Air Force One carrying Donald Trump landed in Singapore on Sunday evening, Kim Jong-un reportedly travelled by a Chinese plane, deployed for his personal use, and was received by Singaporean foreign minister.
"Very good, very good".
"We will make sure that every dollar is spent appropriately", he said.
Rodman, who is one of a handful of Westerners to have visited reclusive North Korea and met Kim Jong Un, arrived in Singapore on Monday, the eve of the summit, declaring he was "excited to be part of it".
But they were soon smiling and holding each other by the arm, before Trump guided Kim to the library where they held a meeting with only their interpreters.
It is believed that Trump and Kim will begin with a two-hour one-on-one session with translators, before an expanded meeting that includes advisers.
Accompanying Trump were White House Chief of Staff John Kelly, National Security Advisor John Bolton, and Secretary of State Mike Pompeo.
It's a neutral player in the region and both the USA and North Korea have embassies there.
"I hope that a major agreement on ending hostile relations (between United States and North Korea) and the denuclearization of the Korean Peninsula is reached through this time's summit", Moon said.
Garrett also asked the president about verifying North Korean compliance. And that suggests, perhaps, a confidence level on the North Koreans that this summit might go well.
The White House said later that discussions with North Korea had moved "more quickly than expected" and Trump would leave Singapore on Tuesday night after the summit, rather than Wednesday, as scheduled earlier. "But they'll come off - as you know and as I have said, the sanctions right now remain but as a certain point I actually look forward to taking them off and they'll come off when we know we're down the road where it's not going to happen, nothing is going to happen".