It also shows tremendous confidence both in the J-20 as a mature platform and Russia as a military partner. The "reciprocating" gesture would have been Russia sending Su-57s, only I don't think sending prototypes is a thing. Sending Su-35s wouldn't really signal anything since China already has those.So this was the new equipment Yankeesama was talking about… Sheesh. China definitely demonstrated tremendous good will. Russia should at least have sent Su-35s.