In reply to Blizzard:
Some of that is true; some is probably true. The Russian and Ukrainian troops used to get along quite well, and have previously engaged in various joint exercises, and were quite welcome. It should be noted that many of the troops being moved into Crimea are not the troops that were already there but have been called from other regions of Russia e.g. the North Caucasus.
But... the agreement is, and always been, that Russian troops go outside their bases do so with the agreement of the Ukrainian government. What is currently happening is that Russian troops (in poor disguise) are preventing Ukrainians troops from entering their own bases, are blockading Ukrainian naval vessels in or out of naval harbours, and have stationed themselves at various points around the Crimean peninsular outside of their bases.
This is, I understand, not so welcome.
It is a bit like if a NATO Scandinavian country started placing troops in Scotland, with the agreement of the Scottish government, and ejecting British troops from bases in Scotland.
I am not against Scottish independence, but neither Scotland nor Crimea has the right to secede to independence/a foreign power without the host state's agreement.
Post edited at 13:32