All the initial reports that I saw stated that Georgia was the one who provoked this current crisis by moving it's military into South Ossetia in a vain attempt at taking over. Shooting down a couple of Russia's fighters probably didn't help matters.
South Ossetia is still an offical part of Georgia, so really they were just securing there own territory.
An interesting point I heard earlier. Look at the response times between Georgian troops attacking South Ossetia and the Russian reaction. Either they have super fast reactions and transport or the Russians "knew" something was going to take place.
wouldn't surprise me if the Russians had troops at the ready for a moment like this to "peacekeep". Russia wants Georgia back under their control and what better way than come to the "aid" of pro-Russian states in Georgia.
thats what Im getting out of this, I think the Russian were chomping at the bit for this chance.