When asked if there was a discussion of pulling the roughly 28,000 U.S. troops out of South Korea, Trump said the topic never came up.
"It's interesting because we believe Kim speaks English - he was educated in Switzerland and speaks German, but Trump seems to be the only one talking during their bit of chit chat", Professor Hajek told Yahoo7.
"Very good, very good".
The leaders will meet on Tuesday on the resort island of Sentosa and talks are expected to centre on ending the North's nuclear weapons and missile programmes in return for diplomatic and economic incentives. According to Trump, it's a "very important" and "pretty comprehensive" document.
Sitting alongside Kim, Trump said the two leaders "have developed a special bond" and that after several hours of talks Tuesday and the signing of the agreement he thinks the US relationship with North Korea "will be very different than in the past".
United States warns UAE aid must flow through Yemen port
UAE forces are poised to attack the port of Hodeidah as early as Tuesday as part of their campaign with Saudi Arabia to defeat the Houthi rebels who have seized much of north Yemen.
After all the chumminess between the two leaders was over, Trump and Kim signed a document stating that Pyongyang would work toward "complete denuclearization" of the Korean peninsula.
Kim's full delegation has not yet been confirmed, but other prominent North Korean officials seen in photos included foreign minister Ri Yong Ho and Kim Chang Son - the man who has been in Singapore in recent weeks negotiating logistical details for the summit.
Members of the U.S. delegation, including USA secretary of state Mike Pompeo, right, and John Bolton, national security adviser, left, and North Korean advisers watch a television screen showing the meeting. Trump spoke to South Korean President Moon and Japan's Prime Minister Shinzo Abe, both key allies of Washington in the region, to discuss developments ahead of the summit. "We will all know soon whether or not a real deal, unlike those of the past, can happen!"
North Korea also serves as a valuable buffer state between China and U.S. forces in South Korea.
Donald Trump says he will have a "terrific relationship" with Kim Jong Un as they appear together for the first time in Singapore. The North Korean leader's sister and close confidante Kim Yo Jong was among the lunch party.
The U.S. will move to tighten the punishing measures if diplomacy fails, he added. "I too spent a sleepless night.I ardently hope for a successful meeting that brings us complete denuclearisation and peace".