Russian 4++ generation Su-35S fighters with a modern radar station (RLS) are replacing the A-50 "flying radars", according to the Fighterbomber Telegram channel.
The Su-35S has been forced to, but quite confidently and vigorously, replace the A-50. You can see the result in the news.
The Su-35S carries the N035 Irbis phased array radar. It can detect and transmit data on 30 air targets. The detection range for large targets is 400 km.
About the Su-35S fighter:
The Su-35 (NATO codification: Flanker-E+) is a super-maneuverable multirole fighter with a controlled thrust vector of the 4++ generation. The Su-35 can use the entire range of existing and future models of air-to-air and air-to-surface aviation weapons, including high-precision ones.
The main armament of the Su-35S is short, medium and long-range air-to-air missiles, a 30-millimeter GSh-30-1 aircraft gun, Kh-59M, Kh-31 and Kh-35U anti-ship missiles, various types of unguided munitions and high-precision ones.