It's all part of the US encircling plan aimed to contain China's growing influence in the region, even then Myanmar wouldn't dare take US for granted over China, as the Chinese are the major arms suppliers as well as the most biggest contributer to Myanmar's economy. A more warm diplomatic ties...
I recently read a piece of article, where BAF confirmed the purchase of 16 F-7BGIs fitted with precision guided missiles system from China. Nevertheless, aren't the F-7 a bit obsolete? Even after being fitted with PGM cause, this won't actually make them anymore edgile or faster in future...