well Doklam is a crazy area to go to war over - a tiny plateau (89 sq kms) that slopes down to the east into Bhutan and the argument seems to be exactly where the boundary lies across it
Not helped by the fact that Tibetan herdsmen have grazed the area in the summer for generations. The Chinese are sticking to a descrpttion in the Anglo -Chinese Treaty of 1890 (when the detailed geography wasn't really well known) and the Bhutan side on traditional useage.
The fact that India controls Bhutanese foreign relationships doesn't assist