At least one senior junta officer trained in Japan has been involved in atrocities against the civilian population since the coup.
The global charity appeared to put resistance groups and junta forces in the same category when it called for an end to attacks on schools and their use as camps.
Human Rights Watch has apologized for the letter, which addressed regime chief Min Aung Hlaing as “prime minister”.
The meeting in Naypyitaw came as the junta continues to detain a Japanese filmmaker and Tokyo is being urged to cut all military ties with the regime.
Brig-Gen Tin Soe, who was trained at Japan’s Ground Self Defense Force Staff College, was involved in the burning alive of 35 civilians in Kayah State, HRW said.
An air force colonel, who trained in Japan, is accused of controlling bombing missions against civilians in Magwe Region.
One year after the bloc’s failed Five-Point Consensus was agreed, western countries were also criticized for a lack of action and standing behind ASEAN’s hollow words.