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Why are interest rates on saving accounts so low in USA and Europe?
Typically developing economics are marked by moderate to high inflation [as they are growing at a faster pace], higher in savings rate and higher lending rates. If you reduce the lending rate, more business / start-up will borrow at cheaper rate, this in turn means lowers savings rate and leads to higher inflation. To combat this Central Banks make borrowing expensive, which lowers inflation and increases the saving rate. Essentially all these 3 are tied up. As to why these countries offer higher interest on USD is because most of the developing countries have trade [current account] deficit. They need to bring in more USD in the country. One of the ways is to encourage Non Resident Citizens to park their foreign earning back home, ensuring more funds USD inflow.  The rate differential also acts as a guide as to how the currency would be valued against USD. For example if you get 8% on USD, less than 12% had you converted same to Rouble, at the end of say 3 years, the exchange rate between USD and Rouble would factor that 4%, ie rouble will go down. Developed countries on the other hand are marked by low inflation [they have already achieved everything] as there is no spurt in growth, it more BAU. They are also characterized by low savings and lending rates.