The military wing of the Ulster Defense Assn., the largest Protestant paramilitary group in Northern Ireland, claimed responsibility for the murder of one of the group’s leaders. The outlawed loyalist group, the Ulster Freedom Fighters, said it “executed” defense association leader Jimmy Craig. He was killed when two masked men entered the Castle Inn bar in Belfast on Saturday, forced customers to lie on the floor and opened fire. Another man was also killed and four people were wounded. The Ulster Freedom Fighters said Craig had conspired with the Irish Republican Army to murder the UDA’s second-in-command, John McMichael, who died when a booby-trapped bomb exploded under his car last year.