Under the presidency of Vladimir Putin, Russia had been granting citizenship and distributing passports to virtually all of the adult residents of South Ossetia and Abkhazia, the much larger separatist region on the Black Sea where Russia also massed troops over the weekend.
The West was skeptical about the validity of Russia's handing out passports by the thousands to citizens of another nation. But whatever the legal merits, the Kremlin had laid the foundation for one of its public relations arguments for invading Georgia: Its army was coming to the aid of Russian citizens under foreign attack.
I don't think anybody in Israel has given any thought to this aspect but in a future situation, hypothetical, of course, if Jewish revenants in Judea and Samaria which is not under Israel's sovereignty - due to some negotiated framework that avoids that issue - come under attack (real, not like in South Ossetia), well, we would surely expect Israeli troops to protect us from terror attacks, shootings, pillaging and what not. So, there is a precedent.