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If Russia were to attack the South, are they planning to get Moldova? They already have 1.5 - 2k soldiers in Transinitria and they also have a huge stash of ammo and such there. Moldova barely has a military so they'd be gone rather fast
Technically they can attack from any point. Though it would be nice to drag all damaged military hardware along lines where Russian would attack. Nothing is more devastating for soldiers going to war than blow up military hardware they hope will help them survive.