The Bank of Cyprus headquarters in Nicosia, Cyprus.

Wealth travels wherever wealth is treated best. And for decades, Russian wealth was treated well in Cyprus. The tiny island-state has long been the largest destination for Russian capital and largest direct investor in Russia.

According to Global Financial Integrity, the financial-watchdog group, Russians invested $199.7 billion in Cyprus in 2011, while Cyprus sent $128.8 billion into Russia. That's about five times the annual GDP of Cyprus.