Fifty months into a war that has consumed generations of soldiers and stockpiles of arms, Ukraine stands at a threshold where endurance itself has become the contested terrain. The weapons, the men, and the institutional resolve that held the line through the early years are showing the wear that only sustained attrition can produce. Russia, having absorbed its own catastrophic losses, now watches for the moment when exhaustion becomes opportunity. What unfolds in the coming months may not end this war, but it may determine the shape of everything that follows.