International backing == bhutan
India moved troops because of the fear or as usual unwarranted concerns that china can capture India's neck (siliguri corridor).
although siliguri corridor is miles far away from the actual construction of a road. that cant be captured until there wouldn't be full conventional war. because Siliguri Corridor is being protected by difficult terrains, rivers that make sure the safety of both side naturally.
India is saying it is our move to save our sovereignty and that's why Indian chest thumping is going on all over India that India stopped a road construction and saved her sovereignty.
To stop construction of a road and call it saving your sovereignty is totally insane.
The bold part, am sure you are speaking from your extensive exposure to the area right?