Plausibility Check: Imperial Russia annexes Romania

what is the best time or PoD for Russia to annex Wallachia and Moldova/Bessarabia (and possibly Transylvania), be it by conquest or political marriage? Would such an annexation be of interest to them? Could they trade their possession of Finland for such territories or could they annex them alongside it?
 
All of Moldova (Principality of Moldavia, really) seems most likely--seize it off the Turks/Poland, and integrate it like Georgia perhaps? Wallachia might be a bit harder, and Transylvania was an integral part of Hungary (and Austrian Empire). The most likely time for this to happen is before the annexation of Finland, unless you mean "Old Finland", which there's no real reason for Russia to want to/have to give up such territories for the Romanian principalities at that point.

After Romania itself forms, Russia would probably be most interested in making a buffer state/loyal regional ally out of it.
 
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