What risks and uncertainties affect international banking?

"The World’s Biggest Banks, 2017 BNP Paribas (France) Mitsubishi UFJ Financial Group (Japan) Table 15.7 Source: “The World’s Biggest Banks in 2017: The American Bull Market Strengthens,” Forbes, http://www.forbes.com, May 24, 2017. The United States has four banks listed in the top 10 world’s biggest banks, as shown in Table 15.7. Political and economic uncertainty in other countries can make international banking a high-risk venture. European and Asian banks were not immune to the financial crisis of 2007–2009. In fact, several countries, including Greece, Portugal, Spain, and Ireland, continue to rebound slowly from the near-collapse of their economic and financial systems they experienced a decade ago. Financial bailouts spearheaded by the European Union and the International Monetary Fund have helped stabilize the European and global economy. It is unclear at this writing, however, whether the impending “Brexit” move by the United Kingdom (leaving the European Union) will impact international banking, as many of the world’s top financial institutions seek to move their global operations out of London and shift them to other financial capitals within the eurozone."