A Myanmar court on Tuesday sentenced a prominent ethnic Rakhine leader to 20 years in jail for treason, a verdict likely to intensify anger amid fighting between the ethnic group and the army.Security forces tried to calm hundreds of supporters outside the court in Rakhine state capital Sittwe as Aye Maung was escorted to a waiting police van following the verdict.Aye Maung, the former chairman of the Arakan National Party – which is renowned for hard-line views against the Rohingya Muslim mi