If NATO was directly part of the conflict, Turkey as a NATO member would be expected to be 100% on NATO's side, not "balancing" its allies against their enemy. If it was still trying to "balance" in that situation, it would either stop real fast or else end up expelled from NATO. In an actual shooting Russia-vs-NATO war, nobody would care about the legal niceties over whether NATO members can be expelled – the other members would just agree to do it, and the lawyers can debate the legality of it when the war is over.