U.S. Secretary of State Mike Pompeo, right, speaks as South Korean Foreign Minister Kang Kyung-wha, center, and Japanese Foreign Minister Taro Kono listen during a joint news conference in Seoul, June 14, 2018.
Trump was also optimistic about the progress they achieved, stating, "We are going to take care of a very big and very risky problem for the world".
Mr Trump tweeted: "Just landed - a long trip, but everybody can now feel much safer than the day I took office".
Moon highly valued the DPRK-U.S. summit as the two countries, which had maintained hostile relations for several decades, held the first-ever summit and promised to establish new bilateral relations for a lasting and stable peace regime of the Korean Peninsula and the complete denuclearization.
USA presidents typically do not salute military officials with adversarial nations.
"The world should rest assured the United States, Republic of Korea and Japan remain committed to achieve complete, verifiable and irreversible denuclearization of North Korea", he said.
Richard Nephew, a nonresident senior fellow on foreign policy at the Brookings Institution, said he believed the most important element of the Trump-Kim statement was the delegation to Pompeo and "a relevant high-level DPRK official" to continue the negotiations, ensuring that there will be a reversion to more technical and detailed talks.
Defence Minister Itsunori Onodera said Japan saw "US-South Korean joint exercises and the US military presence in South Korea as vital to security in East Asia".
In a further tweet on Wednesday, President Trump hit out at criticism of his summit in some United States media, dubbing it "Fake News".
Such a withdrawal would be problematic for Japan, to which the USA has long provided security assurances, while it would be welcomed by China, which wants to expand its influence in the region.
"Despite its many flaws", Cha wrote, "the Singapore summit represents the start of a diplomatic process that takes us away from the brink of war".
Moon and Xi have advocated a phased approach to negotiations and moved to quickly fix ties with North Korea, while Japan wants a US-led "maximum pressure" campaign to continue.
North Korean viewers had to wait nearly 20 minutes into the program for Trump's first appearance.
Sebastian Vettel wins Canadian Grand Prix
After arriving in Montreal , Verstappen half-jokingly threatened to head-butt any reporter who asked about the crashes. But when the race restarted on lap five Vettel put his foot down and pulled away - and that's where he stayed.
Andy Murray looks to sport management role for future talent
He says that he still wishes to compete in professional tennis but he also wants to expand his prospects and share his knowledge. At the moment he is juggling many balls and he wants to remain focused on what he knows, but over time his company will develop.
Tips to improve your site ranking
Improve your website speed A slow website is boring so you must keep improving the speed to offer a better user experience. At least 82 % of videos on the search result pages are from YouTube and it has more than 3 billion searches per month. 2.