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How realistic is this after Moldovan independance? People in both countries expected it (or feared depending if you spoke Romanian or not) but later things cooled off. Transdniestria would either have to become really independant or given special protection.
IMO if you can somehow improve relations between Moldovans and Russians/Ukrainians and don't have them fight it out in 1992 then merger is possible.
Would it effect Romain accession in EU and NATO? Later might freak out Russians even more than it did.