US President Joe Biden landed in Asia on Saturday vowing to urge Chinese leader Xi Jinping to rein in North Korea when they hold their first face-to-face meeting at next week's G20 summit.

Biden touched down in Phnom Penh for meetings with Southeast Asian leaders ahead of his encounter with his Chinese counterpart on Monday in Bali.

The meeting between the two superpowers comes after a record-breaking spate of missile tests by North Korea sent fears soaring that the reclusive state would soon conduct its seventh nuclear test.

In Monday's meeting on the sidelines of the G20 summit, Biden will tell Xi that China – Pyongyang's biggest ally – has "an interest in playing a constructive role in restraining North Korea's worst tendencies," US National Security Advisor Jake Sullivan told reporters.

Biden will also tell Xi that if North Korea's missile and nuclear build-up "keeps going down this road, it will simply mean further enhanced American military and security presence in the region."

Sullivan said Biden would not make demands on China but rather give Xi "his perspective".

This is that "North Korea represents a threat not just to the United States, not just to (South Korea) and Japan but to peace and stability across the entire region."

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