The last time it happened - mid 198x - the USSR collapsed.
The oil price drop in 2014-2016 delivered a significant jolt to Russia causing economical crisis https://en.wikipedia.org/wiki/Russian_financial_crisis_(2014.... Among other effects, that affected new weapons systems and armed forces modernization, etc. It also lead to very unpopular pension (social security) eligibility age increase. Also https://en.wikipedia.org/wiki/Russian_financial_crisis_(2014... :
"According to New World Wealth study, over 2,000 millionaires emigrated from Russia."