Bacardi has taken new legal action in its long-running rum war with Cuba, this time against banking regulators in a hunt for information about how an entity owned by the island nation last year received a U.S. license to renew the disputed “Havana Club” trademark.

Bacardi & Company Ltd. and Florida-based Bacardi U.S.A. Inc. on Wednesday filed a Freedom of Information Act lawsuit against the U.S. Treasury Department. The complaint in Washington federal district court said the U.S. government has failed to turn over documents Bacardi requested in January 2016 about the Treasury Department's decision to reverse course and allow the state-owned Cubaexport to renew its “Havana Club” trademark.

The retroactive renewal of Cubaexport's trademark registration, through a license issued by the Office of Foreign Asset Control, “violated well-settled United States law (and more than fifty years of U.S. foreign policy),” Bacardi's lawyers at Kelley Drye & Warren said in their complaint.