yangon unite nations name new interim u.n. resident coordinator myanmar tuesday appoint knut ostby norway take humanitarian role time grow strain myanmar government handle rohingya crisis appointment temporary placeholder expect myanmar block upgrade u.n. country chief position myanmar de facto leader nobel peace prize winner aung san suu kyi tell diplomats private meet frustrate unite nations particularly human right arm ostby serve unite nations number hotspots include afghanistan east timor replace renata lok-dessallien complete term 600,000 rohingya muslims flee bangladesh ethnic violence erupt myanmar northern rakhine state late august right monitor rohingya refugees say army rakhine buddhist vigilantes force flee home u.n. investigators interview rohingyas live refugee camp near cox bazar say friday gather testimony point consistent methodical pattern kill torture rape arson fact-finding team lead former indonesian attorney general marzuki darusman say death toll myanmar army crackdown follow rohingya insurgent attack aug. 25 unknown may turn extremely high u.n. team establish u.n. human right council march renew appeal access rakhine state talk myanmar government military establish facts early stag crisis unite nations describe military campaign ethnic cleanse accusation reject myanmar say military engage counter-insurgency operations rohingya militants behind series attack security post suu kyi say refugees return thousands continue arrive bangladesh myanmar overwhelmingly buddhist country small christian muslim minorities struggle emerge decades military rule suu kyi democratically elect government engage peace dialogue members various arm ethnic group u.n. pick norwegian myanmar role tensions simmer rohingya crisis