Provide sources that indicate that Russia is not using combined arms cause last I checked, in most operations conducted by actual Russian forces or by the PMC Wagner group, which is currently taking Bakhmut, they are provided artillery, air cover/support, armored and mech assets along with ground forces.
I apologize. The russians probably are using combined arms in some form or other, they're just using them in their typical mongoloid fashion. The burnt out hulks of russian armor are a testament to their incompetence.