The math doesn't work out for Russia: Why Putin will never go to war against Europe. On the one hand, Russia would have to accept much more military spending.
A doubling of military spending could raise it from six to 12 to 15 percent of GDP - the level that caused the Soviet economy to collapse in the 1980s. A tripling would be even more devastating for the economy. It is not clear how long Russia can maintain its “war economy” According to the independent expert Michael Rochlitz, Russia’s economy is now almost completely subordinated to the goal of winning the war.