(April 4, 2019, 1:52 PM EDT) -- WASHINGTON, D.C. — The Federal Republic of Nigeria on April 1 filed an opening brief in its appeal to the District of Columbia Circuit U.S. Court of Appeals, challenging a judge’s order that granted a motion for a briefing schedule in an action to confirm a $6,597,000,000 award, arguing that the court erred in requiring Nigeria to assert defenses to confirmation of the award before first making a sovereign immunity determination (Process and Industrial Developments Limited v. Federal Republic Of Nigeria, et al., No. 18-7154, D.C. Cir.)....