Argentina quickly said it would file a court appeal after a U.S. federal judge ruled Wednesday that bondholders can seize $105 million in Argentine central bank deposits held in the United States.

A bank spokesman told The Associated Press that Argentina was optimistic because similar rulings had been overturned.

The decision, nevertheless, drove down Argentine bond prices just as the cash-strapped government prepares a $20 billion debt-swap offer in hopes of satisfying the bondholders and ending the lawsuits.

Argentina has been in a seemingly endless legal battle with bondholders who refused to accept about 30 cents on the dollar for debt they bought before the country's record $95 billion default in 2002.

U.S. District Court Judge Thomas Griesa in New York said Argentina is willfully defying its legal obligations and "has thus enmeshed the court in years of wasteful litigation with no end in sight."

More threatening for Argentina is the basis for his ruling: that President Cristina Fernandez has proven through her actions that the country's Central Bank lacks independence. That could expose Argentina's funds to other seizures, and increase the perception around the world that the country is a risky place to invest.

The judge issued the order at the request of the hedge fund firm Elliott Management Corp. and an affiliated company, NML Capital Ltd.