"We are saying that if we can get Russian Federation to partner with us, to help stop North Korea from developing nuclear weapons, and if we can partner with Russian Federation to provide peace in the godforsaken area of Syria right now, that those are positive developments".
On Friday he warned world leaders gathered in the Vietnamese resort city of Danang that the Asia-Pacific region "must not be held hostage to a dictator's twisted fantasies". He added that Trump showed his "true nature as destroyer of the world peace and stability" on his "warmongering" visit.
Pyongyang issued its own retort Saturday branding Trump's Asia tour a "warmonger's visit for confrontation to rid the DPRK of its self-defensive nuclear deterrence", in the first comments on the trip by a North Korean official.
The outburst came as Trump nears the tail end of his sweep through Japan, South Korea, China, Vietnam and the Philippines that has seen him rail against the North's nuclear ambitions and deliver his "America First" vision of global trade.
The four-day exercise in the western Pacific involves USS Ronald Reagan, USS Nimitz and USS Theodore Roosevelt - as well as seven South Korean vessels, including three destroyers.
South Korea and the United States started large-scale military manoeuvers on Saturday off the Korean peninsula in which three American aircraft carriers are taking part.
Free meals, treats for military members on Veterans Day
Active and retired Military personnel will be offered 3 day passes for just $156, and 4 day passes for $181 until December 19. Veterans and military members can also get free entry to federal, state, local, and national parks during the holiday.
During Saturday's summit, Moon and Xi also agreed to quickly normalize bilateral exchanges in all sectors, Yoon added, repeating what was said in the agreement announced last month when the two countries agreed to end a year-long standoff over the deployment of a US anti-missile system.
They will aim to enhance combined operation and aerial strike capabilities and also display "strong will and firm military readiness to defeat any provocation by North Korea with dominant force in the event of crisis", Seoul's military said in a statement.
While in South Korea, Trump had warned the North not to underestimate the US and has called on nations to stop financing and trading with the regime.
In recent months, North Korea has tested intercontinental ballistic missiles that could reach the USA mainland with further development and has conducted its most powerful nuclear test.
Xi told Moon that he encouraged South Korea to resume dialogue with North Korea and re-engage with them for reconciliation and de-nuclearization, state news agency Xinhua reported.
It has repeatedly threatened to launch ballistic missiles into the waters around the US territory of Guam.