The bold and surprising incursion across the border into the Kursk region of Russia has won Ukraine the temporary possession of several Russian villages and a few hundred square miles of Russian territory. But the strategically cheap Russian land may have been bought at a very costly price. The Ukrainian armed forces managed a lightning advance through largely undefended territory. But that territory is defended now, and the advance seems already to have been slowed. And though it seems to have lost momentum well short of its goals, Ukraine may still have to pay the full price. Ukraine’s...
















