Dentons is suing the Republic of Guinea for more than $10 million in allegedly unpaid legal bills, plus interest.

In a lawsuit filed on Friday in the U.S. District Court for the District of Columbia, the firm said it was hired in 2012 to work with Guinea on the development of a large mining and infrastructure project. Guinea didn’t object to Dentons’ work or its invoices, the firm claimed, but never paid what it owed in fees and costs.