unite nations u.n. secretary-general antonio guterres u.n. security council wednesday urge myanmar authorities end violence majority-buddhist country rohingya muslims force 400,000 people flee bangladesh guterres say situation myanmar western state rakhine best describe ethnic cleanse one-third rohingya population flee country could find good word describe tell news conference call myanmar authorities suspend military action end violence uphold rule law recognize right return leave country say guterres add speak several time myanmar national leader aung san suu kyi exodus refugees spark security force fierce response series rohingya militant attack aug. 25 press problem suu kyi face since become leader last year government say target terrorists refugees say offensive aim push rohingya myanmar 15-member security council meet behind close doors wednesday request sweden britain discuss crisis second time since begin agree publicly condemn situation council express concern report excessive violence security operations call immediate step end violence rakhine de-escalate situation re-establish law order ensure protection civilians ... resolve refugee problem british u.n. ambassador matthew rycroft say first statement security council myanmar nine years statements agree consensus russia china traditionally protect myanmar action myanmar say last week negotiate russia china ensure block censure security council violence rakhine state unite nations top human right official early week denounce myanmar conduct cruel military operation rohingya brand textbook example ethnic cleanse suu kyi cancel trip u.n. general assembly new york next week deal crisis rycroft say two high-level meet myanmar due hold gather world leaders unite nations humanitarian situation catastrophic guterres say dramatic tragedy people die suffer horrible number need stop u.n. chief security council call myanmar end violence