For those who are new to the subject — indeed, for those who have been following it for many years — the Ukrainian crisis can seem murky. The Ukrainians have a president, Viktor Yanukovych, who granted himself dictatorial powers and then repealed some of them; announced a truce and then broke it; claims to enforce the law but employs thugs who haul journalists out of cars and shoot them. The Ukrainian opposition, meanwhile, has three separate leaders who may or may not actually control the Uk...