North Korean leader Kim Jong Un declared Pyongyang's unstinting "friendship, unity and cooperation" with Beijing during his third visit to China this year.

North Korean leader's two-day visit which ends Wednesday (Jun 20) is designed to reassure Beijing that Pyongyang will not neglect its interests as he move into diplomatic terrain with United States President Donald Trump .

North Korean leader Kim Jong Un has met with Chinese President Xi Jinping in Beijing on Tuesday for their first face-to-face talks since Kim's historic summit with US President Donald Trump in Singapore.

President Trump and Kim Jong Un met for the first time in Singapore on June 12, shaking hands against the backdrop of U.S. and North Korean flags level and side-by-side.

China is North Korea's most important diplomatic and economic backer but has been angered by Pyongyang's nuclear and missile tests.

China has backed United Nations sanctions against its ally but indicated last year that the UN Security Council could consider easing the punitive measures.

The United States, which has substantial presence in South Korea, was on a war footing with the North over Pyongyang’s nuclear and missile programs.