A.I.G. sued the government last month in a bid to force it to return $306 million in tax payments, which stemmed in large part from its use of aggressive tax deals, some involving entities controlled by the company’s financial products unit in the Cayman Islands, Ireland, the Dutch Antilles and other offshore havens.

A.I.G. is effectively suing its majority owner, the government, which has an 80 percent stake and has poured nearly $200 billion into the insurer in a bid to avert its collapse and avoid troubling the global financial markets.

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