Can you not read? The Russian financial crisis happened. It had absolutely nothing to do with someone getting access to their "secret sauce".
For the no wild-eyed conspiracy types, they were essentially arbing a spread on fixed income that gave a very reliable but minute profit. They levered it up to turn that into a reliable but larger profit. Then suddenly the Russian financial crisis caused a hiccup that required them to post more margin than they had, so they had to sell out at firesale prices. They were still right, eventually it went back to small and reliable, they just weren't robust to the black swans. Or as they say they were picking up nickels in front of a steam roller.