"But Russias difficulties are disproportionate to the size of the shock: While oil has indeed plunged, the ruble has plunged even more, and the damage to the Russian economy reaches far beyond the oil sector.
The kind of crisis Russia now faces is what you get when bad things happen to an economy made vulnerable by large-scale borrowing from abroad specifically, large-scale borrowing by the private sector, with the debts denominated in foreign currency, not the currency of the debtor country. So why did it borrow so much money, and where did the money go?
Well, you can answer the second question by walking around Mayfair in London, or (to a lesser extent) Manhattans Upper East Side, especially in the evening, and observing the long rows of luxury residences with no lights on residences owned, as the line goes, by Chinese princelings, Middle Eastern sheikhs, and Russian oligarchs. Basically, Russias elite has been accumulating assets outside the country luxury real estate is only the most visible example and the flip side of that accumulation has been rising debt at home.
Where does the elite get that kind of money? The answer, of course, is that Putins Russia is an extreme version of crony capitalism, indeed, a kleptocracy in which loyalists get to skim off vast sums for their personal use. It all looked sustainable as long as oil prices stayed high. But now the bubble has burst, and the very corruption that sustained the Putin regime has left Russia in dire straits."