Washington Post columnist Marc Thiessen said Wednesday that in order for President Donald Trump to make progress in his denuclearization talks with North Korea, he must look dictator Kim Jong Un "right in the eye and say 'I'm not like my predecessors.'"

China claimed Wednesday that North Korea planned to denuclearize the Korean Peninsula with some conditions after an unprecedented visit from the dictator.

According to Chinese media, Kim visited China between Sunday and Wednesday. Trump praised the progress, tweeting that he is looking forward to his meeting.

"The only way this is solved peacefully is if Kim Jong Un understands that Donald Trump actually means it when he says, 'I will not allow you to threaten an American city with a nuclear ICBM,'" Thiessen said.

Regarding China's progress in talks, White House Press Secretary Sarah Sanders said in a statement, "The United States remains in close contact with our allies South Korea and Japan. We see this development as further evidence that our campaign of maximum pressure is creating the appropriate atmosphere for dialogue with North Korea."

Despite the meeting with China, Thiessen says Kim has no plans to denuclearize at the negotiating table.

Kim's meeting with Chinese President Xi Jinping was his first with another head of state and first known trip outside North Korea since he assumed control of the country in 2011.

Watch the discussion above.