A long explanation on Ethiopia's governance and wider issues (not the small wars as above post), with more detail than I have seen before:https://www.opendemocracy.net/ren-le...e-warning-shot

It opens with:
The Tigray Peoples Liberation Front (TPLF), the strongest component of the ruling coalition, from the middle of 2014 has faced the highest level of Tigrean popular discontent since its inception 40 years ago. That came first. Now the unrest in the most populated region of Ethiopia has sent to the regime as a whole the most shattering warning shot since its arrival in power in 1991.