At the United Nations General Assembly, Ethiopia's president warned the world of forces threatening his country's cohesion, even as Tigray rebels and allied armed groups launched a coordinated offensive across the north — seizing airports and striking government positions. The synchronized nature of the assault marks a troubling departure from isolated skirmishes, raising the specter of a renewed civil war in a nation still carrying the wounds of recent conflict. What unfolds next in the Horn of Africa will be felt far beyond Ethiopia's borders.