The White House has expressed cautious optimism after North Korean leader Kim Jong-un's surprise meeting with Chinese President Xi Jinping in Beijing.

Press secretary Sarah Huckabee Sanders said during a news briefing on Wednesday that the White House is cautiously optimistic, but also believes "things are moving in the right direction."

She added that Kim's meeting with Xi was a good indication that the maximum pressure campaign against Pyongyang has been working.

Meanwhile, U.S. President Donald Trump tweeted earlier in the day that he received a message from Xi Tuesday night that the meeting “went very well" and that Kim is looking forward to his meeting with Trump.

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