Fuel and ammunition and maintenance of equipment are expenses that will be greater.
But, it’s russia..... in the soviet union stuff was made with no regard for anything other than the production plan
the back load of stuff probably is not only unknown but can’t be measured
fuel is free if you disregard the opportunity cost presuming it can be sold
transport to syria is probably less expensive than transport to far far eastern bases.
I won’t deny some current expense, but it is not Napoleon invaiding Russia