Given their circumstances, they will do what's the best for them, but if they knowingly sacrifice their long term sovereignty for Russia, it will be game over for them. If they stick with Russia for now and later on switch to a possible Turkic union, no problem imo. Let Turkey and Azerbaijan make a solid positive move first (which, im afraid, wont happen with akp in Turkey), then other Turkic countries' interest will slowly grow like a rolling snowball, i think. Especially significant projects like trans Caspian pipeline project would bring Turkmenistan definitely closer to Turkey and Azerbaijan. we really should't be surprised if some Turkic countries make decisions in favor of Russia if Turkey can't mean anything for them in certain fields, those people wanna make progress and develop too, and Russia is unfortunately whom they can economically depend the best on.