IMHO, This is pretty much the strategy the Khans used in the 13th century when they encountered arrogant Islamist Sultans emboldened with the bravery of their faith who refused to capitulate. They killed all the islamic people in Baghdad and then proceeded to fill all their canals and burn all their books. This decisively ended the Islamic golden age and Europe was able to survive after a very difficult 14th century where it would probably have been easily crushed by Islamists from the East had the Khans not set them back at least a few centuries. Truly one of the big turning points in World History.
Oh yeah, we can't do this to Russia because they have nukes, but the Ukrainians are trying to do it piecemeal.