New Delhi, Dec. 6 -- Sudan - Smoke still curled from the wreckage of the Adre border crossing on Saturday, where the RSF accused Sudanese Armed Forces of launching a devastating airstrike that severed a vital lifeline for tens of thousands fleeing the war-torn Darfur region. The attack, which the RSF described as a deliberate bid to choke off humanitarian aid, came as Chad reeled under the weight of a fresh wave of Sudanese refugees, their numbers swelling past 89,000 since the fall of el-Fasher last month. Overstretched camps, crumbling roads, and dwindling food supplies painted a picture of a nation on the edge, with the conflict's tentacles now strangling its neighbor.

In the shadow of the border, where the arid plains of eastern Chad...