The calculation doesn't add up for Russia's economy: Why Putin will never go to war against Europe. Russia's 2024 budget already includes massive investments in 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. Russia will not be able to recover from this. Sanctions will be imposed on Russia – but they won't work.