No one in Russian-speaking Kharkiv wants to follow rebels into open revolt. But locals say Kiev has no idea how badly it's aggravating the region with its initiatives, including the 'Great Wall of Ukraine.' It's been nicknamed the "Great Wall of Ukraine." Its planned combination of barbed-wire fences, watchtowers, berms, and tank traps along Ukraine's 1,300-mile border with Russia look like something you'd find on one of Israel's borders with its hostile neighbors. If it's ever completed, the wall will seal a frontier that, until last year, had always been wide open. Inaugurating construction here last fall, Prime Minister Arseniy...