There’s a famous saying that no military plan survives its first contact with the enemy.

The greatest theorist on war, Carl von Clausewitz, often explained that strategy must be dynamic, constantly changing and rejuvenating itself. In his famous treatise “On War,” he wrote that some generals “consider only unilateral action, whereas war consists of a continuous interaction of opposites.”

The West, says Washington Post columnist Fareed Zakaria, needs to take these lessons to heart in its struggle with Russia and adjust its strategy — which is in danger of failing.