19 January 2019
From the NASA press release: "Since the beginning of its mission, NASA’s Lunar Reconnaissance Orbiter (LRO) has imaged objects impacting the surface of the Moon. This past month, NASA held discussions with the China National Space Administration (CNSA) to explore the possibility of observing a signature of the landing plume of their lunar lander, Chang’e 4, using LRO’s LAMP instrument. Since the Chinese landing, LRO instruments have been collecting data that are currently being analysed. LRO is expected to image the Chang’e 4 landing site on January 31 in a manner similar to what was done on Chang’e 3.  NASA and CNSA have agreed that any significant findings resulting from this coordination activity will be shared with the global research community at the 56th session of the Scientific and Technology Subcommittee meeting of the UN Committee on the Peaceful Uses of Outer Space meeting in Vienna, Austria, February 11-22, 2019. All NASA data associated with this activity are publicly available. In accordance with Administration and Congressional guidance, NASA’s cooperation with China is transparent, reciprocal and mutually beneficial."
link to the Xinhua news about the topic: NASA cooperates with China on Moon exploration
Farside Politics: NASA/China Coordination on Chang’e 4 Lander
19 January 2019
Leonard David summarises what is known about NASA's supportive efforts for China's lunar exploration missions.