Russia is under sanctions and has many attacks on its financial sectors and economy.
To counteract these pressures, Putin is waging war on a budget.
--Conscripts rather than military professionals are deployed in ukraine due to their salaries being considerably smaller
--Tanks which cost around $1.2 million are deployed rather than jet fighters which cost $100 million
--Russian ground forces have no air support as maintenance, ordnance and upkeep of an air force is much more expensive than on tanks and surface vehicles
The only exception to russia's extreme cost savings measures are their alleged launching of hypersonic missiles which cost $100 million each.
The upside to deploying hypersonic missiles is their technology is new and the data which can be gathered through real world application to refine and perfect the technology is worth more than the missiles themselves.