*sigh*
Once again, please look at a map. Unlike Georgia, Russia does not border Moldova.
I don't understand why you think that's important. Russia already is projecting its power into Moldovan territory by keeping Transnistria quasi independent. They have planes, hellicopters, tanks, military envoys. Just because you can't throw a stone into Russia from Transnistria, doesn't mean Russia can't put its military there in hours.
And it's already been pointed out, there is already Russian military there.