Let's see...what is worse, stupidity or breaking international law? Would the second have occurred without the first or were they mutually exclusive and events would have progressed more or less toward the same conclusion.
In any event, I'm making a judgement call. The breach of international law identified in by those investigating the Russian-Georgian 5 day war is worse because it was a set-up (entrapment, if you wish) by the well armed prosecutor, Russia, taking advantage of the incredibly self-pitying and stupid Saakashvili in Georgia; the Russian's knew he would rise to the bait.
The investigative report was even handed; but, the breach of international law by Russia in, first, distributing citizenship papers and passports widely (as has been done in Crimea) and then seizing territory of the adjoining state during a civil war to "protect" it's "citizens" is only marginally better than Nazi Germany's actions in Czechoslovakia and Austria.
That being said, the inconceivable stupidity of Saakashvili in rising to the bait set out by Russia should disqualify him from running the country.