China's friendship with Russia is "rock solid" and the prospects for cooperation are very broad, Chinese Foreign Minister Wang Yi said on Monday.

Cooperation between the two countries brings benefits and well-being to the two peoples, he told his annual news conference on the sidelines of China's annual meeting of parliament.

He also said China was "willing to work with the international community to carry out necessary mediation."

He also described the China-Russia relationship as "the world's most crucial bilateral relationship", which "is conducive to world peace, stability and development".

Just last month, China and Russia on the opening day of the Winter Olympics declared a "no limits" partnership, backing each other over standoffs on Ukraine and Taiwan with a promise to collaborate more against the West.

President Xi Jinping hosted President Vladimir Putin on Friday as the two nations said their relationship was superior to any Cold War era alliance and they would work together on space, climate change, artificial intelligence and control of the internet.

Beijing supported Russia's demand that Ukraine should not be admitted into NATO, as the Kremlin amasses 100,000 troops near its neighbour, while Moscow opposed any form of independence for Taiwan, as global powers jostle over their spheres of influence.