(April 2, 2024, 2:38 PM EDT) -- WASHINGTON, D.C. — The Russian Federation on April 1 filed an appellant brief urging the District of Columbia Circuit U.S. Court of Appeals to reverse a judge’s denial of its motion to dismiss a petition to confirm arbitral awards against it worth more than $57 billion for lack of jurisdiction, arguing that the court wrongly found that it waived its sovereign immunity....