The Chinese space agency reported that they worked together with NASA to get data on the far side of the moon. It is important to note that this is the first case of such cooperation. The fact is that US law prohibits joint space projects with China, if there is no endorsement by Congress.
Deputy Director of the National Space Agency, Wu Yanhua, said on January 14 that NASA had shared information about its orbiting satellite in order to follow the first-ever Chinese lunar lunar moon on the far side.
In turn, China shared the time and coordinates of the planned landing of Chang'e-4. NASA satellite did not catch the exact moment of landing, but received photos of the area later.