YY-20 during Airshow China, in Zhuhai, Guangdong Province. Photo by Deng Hua, 08NOV2022.
I have heard many people say the Y-20 is China’s version of the U.S. Boeing C-17, but if you look at the main wing and nacelles, from above, it is clear it is a development of the old Cold War era Soviet Ilyushin 76.
Two Russian IL-76 transports on McChord Air Force Base, Washington. U.S. Air Force photo by Senior Airman Steve Thurow, 01NOV1995.
Model kit builders: Just take the the Il-76 and stick a C-17 tail on, then get rid of the glass nose.
YY-20 during Airshow China, in Zhuhai, Guangdong Province. Photo via Xinhua, 08NOV2022.
Some Chinese news releases are referring to the YY-20 as the YU-20. In this excerpted air show video, released on 09NOV2022, notice that it starts with a graphic calling the tanker a YU-20:
YY-20 during Airshow China, in Zhuhai, Guangdong Province. Photo via Xinhua, 08NOV2022.
On 01AUG2022, the People’s Liberation Army(PLA)-Air Force announced the successful completion of YY-20 training, which just happened to take place near Taiwan. PLA-AF promotional video:
Also in August, the YY-20 was first used operationally to refuel aircraft taking part in a blockade of Taiwan. I excerpted this video from a PLA Eastern Theater Command report dated 11AUG2022:
PLA Air Force promotional video released on 30AUG2022:
World War 3 Vehicle I-D: 
CHINA MAKES SURPRISE(?) DELIVERY OF MILITARY AID TO RUSSIAN ALLY, USING NEW Y-20!
Labor Shortage: 
CHINA TURNS TO ROBOTS & DRONES TO SUPPLY ITS MILITARY!