There is difference between war that Russia can fight and a war that Russia want's to fight.

Putin's Russia is more dysfunctional than Soviet Union ever was. Russia is solely hydrocarbon based economy. It has military for a typical hydrocarbon based dictatorship.

Regular competent military career officer is a threat to internal security. Top ranks in Russian military are filled with generals with career in internal security (FSB and similar). They are competent in internal security and small "special operations". They don't know how to plan and execute complex military operations. They just yell and punish when things don't go as they planned.