I'll reply by reposting my comment from a different discussion:

Look up the almost total dismantling of any advanced science, r&d and manufacturing base in Russia under Putin’s authoritarian turbo capitalism. His regime basically turned a highly industrialised country with a robust scientific culture and research infrastructure into an almost mono-economy based on the export of raw materials. Even in the defence sector: the Mayak nuclear processing plant for making warhead material (among other radioactive isotope enrichment) stopped processing weapons grade plutonium several years back, most fearsome nuclear armaments decommissioned and not replaced (Russia has only maybe 250 total functional (?) ICBM-SLBM) and almost everything is foreign made, the makers being NATO and US allied countries. In the case of a major conflict how much of that will be reliable?

Though that’s a rhetorical question because as they’ve shown in every military conflict up till now, Russian high command is scared shitless of actual confrontation with the West. In Georgia it was the general and commanders in charge of the actual troops near the border who gave the order to invade as retaliation and when the army was nearing Tbilisi the troops were promptly halted and pulled back, the commanders sacked (even as Putin and Medvedev used the quick annihilation of the Georgian forces engaged for personal patriotic clout). In Libya Russia made the no-fly zone possible in the UN security council but then later (again purely for internal consumption) bitched about it from the safety of a fair accompli. In Ukraine it murdered, pushed into senseless meat grinders and disarmed the native Eastern insurgency against the Kievan neo-nazi regime and after using federal troops to take charge of the rebels completely stopped any and all military advances even when the Ukrainian armed forces were practically non-existent (at least in any other role than harassing civilians), extended credit and low gas prices to a regime that was supposedly its enemy on the behest of western emissaries. In Syria Russia pulled out its military advisors when the conflict began, then made Assad give up his chemical weapons to please Obama and went back in only when the situation became completely hopeless in order to secure a few strips of land in a rump Syrian state. Even then they gave in in every conflict with Turkey or US forces even to the point of feigning ignorance as to the identity of their own soldiers, letting them get massacred by the US without any repercussions. The touted s-400 still standing in mighty silence, not letting itself get provoked by raids from various countries’ air forces.

In the midst of an economic crisis and the need to restart their own production in the face of sanctions the Russian regime chose to invest in US treasury bonds (assets of its supposed enemy) instead of investing in their own economy.