Traveling to Crimea? Don't try landing in Simferopol unless your plane originated in Moscow. Flights from Kiev, Istanbul and several other cities have been suspended for the rest of the week. If you come by train, expect to be searched by pro-Russian militia. If you want to rally in favor of Ukraine's West-leaning interim government, expect to be surrounded by pushy pro-Russians. Breakneck preparations are under way for a Sunday referendum -- to be held largely in secret -- and the grip of security measures is tightening around Simferopol, the regional capital. When Crimeans go to vote, they will have to choose between two alternatives. The ballot questions will be: Do you support reuniting Crimea with Russia, as a subject of the Russian Federation? Or, do you support the restoration of the 1992 Constitution of the Republic of Crimea and Crimea's status as a part of Ukraine? According to the 1992 Constitution, Crimea is really an indepen...