By Ryan Tracy 

Federal Reserve Gov. Daniel Tarullo gave a full-throated defense of the Fed's oversight of foreign banks operating in the U.S. on Thursday, a day after the regulator said three of those firms failed to adequately analyze how they would fare in a severe recession.

Mr. Tarullo laid out the case for a series of recent moves to force foreign banks to hold more loss-absorbing capital in their U.S. units, pushing back against criticism that the Fed was making it harder for those banks to compete or stepping on the toes of European regulators.

"Much of what we have done is simply to catch up" to regulations that U.S. banks face in the European Union and the United Kingdom, Mr. Tarullo said in remarks prepared for a Harvard Law School symposium in Armonk, N.Y. Thursday evening. "The United States is more a follower of the pattern set by the EU than it is an initiator of new kinds of requirements."

The Fed's latest rules for overseas firms, adopted last month, require them to set up a U.S. holding company and maintain minimum levels of capital in the U.S. to protect against losses. During the 2008 crisis, some of those foreign firms came to the Fed for emergency lending, Mr. Tarullo noted.

The Fed also sounded a warning for foreign firms Wednesday when it barred the U.S. units of HSBC Holdings PLC, Royal Bank of Scotland Group PLC, and Banco Santander SA from increasing the dividends they send overseas after their "stress test" results didn't meet the Fed's standards.

Mr. Tarullo didn't address the results of the tests or monetary policy in his remarks on Thursday. He said that rather than violating any international standard for regulation, the Fed's moves are in step with global agreements that allow local flexibility.

Regulators should strive to work together, he said, but "presumptively, at least, nations should be able to adjust their regulatory systems based on local circumstances and their relative level of risk aversion as it pertains to the potential for financial instability."

"These firms cross borders in ways their regulators do not," Mr. Tarullo added. "We cannot ignore this fact and pretend that we have global oversight."

The Fed's limit on bank risk-taking known as the leverage ratio, which the new U.S. rules will apply to European banks, is likely to be matched by European supervisors in the coming years, eliminating any competitive imbalance, Mr. Tarullo said.

"A few foreign banks would prefer the old system under which they held relatively little capital in their very extensive U.S. operations. But that was neither safe for the financial system nor particularly fair to their competitors--U.S. and foreign--that hold significant amounts of capital here," Mr. Tarullo said.

He said the Fed's requirement for foreign firms to create a U.S. subsidiary differs from the way European rules are written, but that came in response to "a small number of very large foreign banks" attempting to evade U.S. capital standards, he said. "We needed to create this structural requirement."

Mr. Tarullo was set to take questions after his remarks.

Write to Ryan Tracy at ryan.tracy@wsj.com

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