A day before he meets Chinese President Xi Jinping, U.S President Joe Biden met with the leaders of Japan & South Korea to coordinate their joint response to North Korea's nuclear programs, as well as to seek input on managing China's assertive posture in the Pacific region. The three leaders sat down for discussions on the sidelines of the East Asia Summit in Cambodia. The allies are worried about the looming risk of North Korea conducting its seventh nuclear test in the coming weeks. On Saturday, U.S NSA told reporters that Biden is also set to urge Xi to use his sway over Pyongyang to rein in the weapons demonstrations. Watch this video for more.