"The traditional friendship between China and North Korea... is a valuable asset shared by both sides," Wang told Pak Myong Ho, the North Korean Vice-Minister of Foreign Affairs who is leading a delegation to Beijing.

"In the face of the turbulent international situation, China and North Korea have always firmly supported and trusted each other, demonstrating the strategic significance of friendly bilateral cooperation," Wang added, according to a Chinese foreign ministry readout.

North Korea on Monday extended its record-breaking number of weapons tests this year with the launch of an ICBM-class missile that has a potential range covering all of the United States, according to Japan's defence ministry.

The Chinese foreign ministry readout of the meeting in Beijing said both sides "exchanged views on issues of common concern" but did not give specific details of what was discussed.

Beijing "is willing to work with North Korea to strengthen communication and coordination, deepen exchanges and cooperation in various fields... and promote the continued and steady development of China-North Korea friendly cooperative relations", Wang added.

China is North Korea's main political and economic backer but relations ground to a standstill after Pyongyang sealed its borders in 2020 following the outbreak of the Covid-19 pandemic.

There are now signs the diplomatically isolated nation is reopening, with leader Kim Jong Un as well as other officials and athletes making rare overseas trips in recent months.

On Saturday, North Korean state news agency KCNA said Pak was heading a delegation to Beijing and had "exchanged views on... strengthening the bilateral relations in 2024" with his Chinese counterpart Sun Weidong.