Cyprus have highlighted the fundamental weakness in the European banking system and the extreme fragility of fractional reserve banking. Cypriot banks invested heavily in Greek sovereign debt, and last summer's Greek debt restructuring resulted in losses equivalent to more than 25 percent of Cyprus' GDP. These banks then took their bad investments to the government, demanding a bailout from an already beleaguered Cypriot treasury. The government of Cyprus then turned to the European Union (EU) for a bailout.