Reports from Chin and Sagaing state suggest that Junta allied Insurgent Groups from India have started attacking into Sagaing state in order to divert attention from the Junta's offensive in Chin state.

India's Northeastern Regions are full of insurgent groups and many of them have very complicated ties to the various groups in Myanmar

While ethnic Factors also play a role due to poor British mapmaking, never heard of before cause for a conflict I know, it's mostly about smuggling routes

The Indian-Myanmar border has several important drug and arms smuggling routes which the various armed groups of both sides of the border seek to control

The Junta has allied with some of the groups and now has seemingly used them to put pressure on the rebels