A YY-20 tanker fitted with WS-20 turbofans.
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What makes you think this is a YY-20 with WS-20s rather than just a Y-20B MRTT in a tanker setup (i.e.: with refuelling pods installed)?
I can't see any definitive indicators of this being a YY-20 style airframe -- there is no clear indicator of a central fuselage refuelling station, and the landing gear bulges are not definitively in the angled fashion of YY-20 as opposed to standard Y-20Bs imo, due to resolution of the image.