In Ukraine, the crisis is a complex one, but some things are beyond argument. Western intelligence has published clear evidence that tens of thousands of Russian troops and their equipment have been sent to territory bordering Ukraine. This one indisputable fact is where the Russian version of recent events starts to unravel.There is one other. The Russian Government has repeatedly warned the interim regime in Kiev not to use violence against protesters who have occupied government buildings in several towns on the eastern side of the country, advice it has evidently decided to ignore.By what right can one government tell another government not to enforce its authority, by whatever means it deems necessary, against those who have broken the law on its ­territory? That is a fundamental