Much of the world has been shocked by Russian brutality in just the four partly occupied Ukrainian provinces. Russian President Vladimir Putin, whose willingness to sacrifice Russian soldiers knows no limits, could still conquer the rest of Ukraine if the coming Ukrainian counteroffensive fails and Western military and financial support are withdrawn. What would a Russian occupation of Ukraine look like? If the behavior of Russian forces since the invasion and Russian history are a guide, worse than anything since the Nazi occupation of Europe. As a start, Ukraine will cease to exist as a sovereign nation and Russia will...