Ukraine transfer S-300 to the borders against Russia.
Russia certainly do the same, as their SAM defence are very weak against the border against Ukraine. Only a SAM regiment defending Voronezh-altimor airbase. Most of the SAM regiments are defending Moscow.
Crimea has also a weak air defence with a S-300 regiment.
The Buks used by Georgia were very succesful against Russian aircraft 2008. This Buks came from Ukraine.
http://www.youtube.com/watch?v=5O3v07R1 ... ata_player
Where is also information of a storage with tactical nukes in Borisoglebsk area. US satellites have information on many aircraft movements to nearby air base. Also a pair of bombers type Tu-22/Tu-160 on base.