I wonder if they are even readily replaceable currently, given sanctions and budget limitations due to prolonged invasion?
I am pretty sure that the Russians will pull them back a bit.
“While over 40 A-50s have been produced, there are only eight of this most advanced version of the aircraft, and any lost in action would be difficult if not impossible to replace. Russia has deployed the planes accordingly, keeping the aircraft well back from Ukrainian air defense systems. Fear of losses was exacerbated following a drone attack on one aircraft in February while it was parked at an aerodrome in Belarus.”
Why Russia now has to use its A-50U closer to the fight in Ukraine
https://breakingdefense.com/2023/12/why-russia-now-has-to-use-its-a-50u-closer-to-the-fight-in-ukraine/#:~:text=While%20over%2040%20A%2D50s,from%20Ukrainian%20air%20defense%20systems