Regulators and officials across the European Union have been nervous about potential contagion to their banking sectors after the recent turmoil in the United States.However, they think the U.S. should learn from some of the regulatory works put in place in the euro area.Basel III is a set of reforms that strengthens the supervision and risk management of banks and has been developed since 2008. It applies to most European banks, but American lenders with a balance sheet below $250 billion do not have to follow them.Chair of the ECB...