YANGON, Myanmar — When Aung San Suu Kyi led the fight for democracy against Myanmar’s despotic military rulers two decades ago, she bristled at the collective reluctance of Southeast Asian governments to intervene in her nation’s plight. In an editorial in Thailand’s The Nation newspaper in 1999, the former opposition leader slammed the 10-member Association of Southeast Asian Nations, saying its “policy of non-interference is just an excuse for not helping.” Today, Suu Kyi leads Myanmar.