I believe KIA has traditionally been aligned with China. One of the main exports of Kachin state is Jade, the value of which (and to whom) should be obvious.I meant the fact that they're converted to christianity during colonial times by western missionaries and were heavily aligned with the west withthose connections to the western world intact so that is why they have western support.
KIA is the only other group besides USWA possesses machinery to manufacture Type 81, of course this can only be obtained from China. For KIA (and USWA), this allows them to generate revenue by selling arms to other armed groups.
It is true that overseas Kachin groups have been known to receive western funding, and this would have some influence.
The Myitsone dam project was a sore point between the locals and China, but overall KIA is considered aligned with China.
It is not unusual to have some disagreements, even USWA was implicated in not doing enough to combat the telephone scams. Senior leaders were declared wanted people in China, USWA threatened back by withholding tin shipments (their major export). Eventually thousands were arrested in Wa State and sent over the border.
(Ok crap source, this was the first that came up, but you can look for others)