This is becoming a far too expensive war for Ruzzia. Putin probably does not care much about using the money for this and the Ruzzians are not going to revolt in the short term for this but...if the trend of refineries being struck continues it may eventually have an effect on the front - not just because the Ruzzian economy really feels the irect pain if this continues, also because it may simply be impossible to defend the vastness of Ruzzia.

Speaking of which, it seems that there are combats in Belgorod. Ruzzian patriots (revolutionaries) have been fighting actively in what is Ruzzian territory. Ruzzia will waste resources too trying to cover such  a large front.