The EU isn't exactly known for being Kremlin propagandists. Here is the link to the 700-page international fact-finding report they published in 2009: https://www.echr.coe.int/documents/d/echr/hudoc_38263_08_Ann...
This Radio Free Europe article is a decent summary of the report: https://www.rferl.org/a/EU_Report_On_2008_War_Tilts_Against_...
Why do you think the international team of Europeans would leave out something like an August 1st attack by Russian forces? Why would the US-funded media outlet for Europe (RFE/RFL) parrot the report's position that the conflict was overwhelmingly Georgia's fault?
"The Mission is not in a position to consider as sufficiently substantiated the Georgian claim concerning a large-scale Russian military incursion into South Ossetia before 8 August 2008."
Can you share the evidence you have that supports your position that Russia attacked on 01 August? The EU concluded that was unsubstantiated.
And if you are that suspicious of that date, we can pick another. In 1992 Russia invaded independent Georgia (among other countries), so any action was towards occupation force, in defense.
PS: and if look throughout the history, we will find very few cases, when a smaller country attacks much bigger one especially after already losing at least one fight against them. And the opposite is true, there are hundreds and thousands of cases when a bigger country attacks the smaller one, especially after already winning once against them. And countless times when a bigger country lied about pretext for such attack, to be seen as not crazy murderers outright, but muddy waters and sow doubt. Russia succeeded it seems.