Cambodia Prime Minister Hun Sen attends the plenary session of the 25th ASEAN summit at Myanmar International Convention Centre in Naypyitaw November 12, 2014. World leaders will descend on the capital of Myanmar this week, an event unthinkable over almost half a century of military rule, amid concern reforms that opened the country to international engagement have gone into reverse. REUTERS/Damir Sagolj (MYANMAR - Tags: POLITICS)