Trump's public response to the intra-Korean meeting has been mostly positive though at times tinged with skepticism.
Russian President Vladimir Putin says North Korea's Kim Jong Un has shown himself to be a mature leader who is interested in calming down the tensions over its nuclear and long-range missile programs.
North Korean leader Kim Jong Un speaks during the Second Plenum of the 7th Central Committee of the Workers' Party of Korea (WPK) at the Kumsusan Palace of the Sun, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang October 8, 2017.
"I don't want to comment on it", Trump told The Wall Street Journal after he was asked directly if he had spoken with Kim. "I'm not saying I have or I haven't".
Trump discussed North Korea in a call Thursday with French President Emmanuel Macron of France.
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The Vancouver meeting, aimed at increasing the US -led pressure campaign against Pyongyang, was announced by Washington just after North Korea's last intercontinental ballistic missile test in late November. He said the North Korean ruler had succeeded in developing a nuclear warhead capable of hitting any target.
"That's good for the United States that they can at least start getting back into talks", she said.
Trump said the stop-and-go nature to his strategy with North Korea is intentional and part of a broader goal.
A South Korean official said Seoul believed the chance of a USA strike was still low.
Such military action, though, would reportedly not lead to a major war with the East Asian state.
The consensus among US intelligence agencies is Kim is convinced Washington seeks to overthrow him and only a nuclear arsenal can deter that.