The Bush administration has been admirably frank and forceful this week in denouncing the fraud in Ukraine and in making clear to Ukrainians that it is on their side. In the coming days it must drive home the message to Mr. Yanukovych that he will be a pariah in Washington — notwithstanding his cynical offer to extend the deployment of Ukrainian troops in Iraq — if he accepts his illegitimate mandate, and that he and all of his governmental and business allies will be held personally responsible for any violence against the opposition. At the same time, President Bush needs to accept that U.S. hopes of cooperation with Russia, in the Middle East or elsewhere, cannot be insulated from Mr. Putin’s anti-democratic imperialism in Eastern Europe. The West must take a clear stand against that policy, before it is too late to prevent a redivision of the continent.