A guarded optimism is rising here that the latest inter-Korean dialogue could reduce tensions and create a mood for talks on the North's nuclear and missile program.

In a telephone conversation with South Korean President Moon Jae-in on Wednesday, Trump welcomed the resumption of talks, saying his country may hold a dialogue with the communist state when the timing and conditions are right.

His conciliatory tone contrasts with last year when Trump frequently exchanged bellicose rhetoric and even insults with Kim, mentioning that all options including military action are on the table. Trump called the North Korean leader a "maniac" and mocked him as "rocket man."

In his interview with the WSJ, Trump said those comments are part of a broader strategy.

"You'll see that a lot with me ... and then all of the sudden somebody's my best friend. I could give you 20 examples," he said.

Asked if he had spoken with Kim since inauguration, Trump avoided giving a clear answer, saying, "I don't want to comment on it. I'm not saying I have or haven't. I just don't want to comment."

The WSJ said Trump praised China's support for global efforts to put more pressure on the North to give up its nuclear weapons program but called for more cooperation, saying "they can do much more." (Yonhap)