MIAMI — A former ballet dancer and member of the Russian military who has been imprisoned as an enemy combatant at Guantanamo for nearly 14 years was given notice Monday that a review board has approved his release from the U.S. base in Cuba. Ravil Mingazov was deemed eligible for release by the Periodic Review Board, an interagency task force set up by the Obama administration to evaluate whether prisoners not facing charges can be released without endangering U.S.