Expansion into Anatolia would likely come in a future Russian, Byzantine war with the ottoman empire, since at this stage without constant great power support, full partition of the ottomans seems inevitable. If the ottomans can not get support or if support toward the Russian and greek side can be bought by promising them ottoman land (likely in Arabia or North Africa) in the same way the Russians otl succeeded in getting the support of the Austrian empire.
In a future war, Russia is likely to expand south from its recently conquered lands in Trebizond to the lands of greater Armenia where there are decent Arminian populations
View attachment 544159
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https://en.wikipedia.org/wiki/Armenians_in_the_Ottoman_Empire)
The Byzantines would push to take cypress western Anatolia and northern Anatolia in order to link up with Russian Trebizond and completely sever the ottomans from the black sea (They would take roughly the solid dark area of the Megali idea, not the dark striped area in order to maintain stability)
View attachment 544172
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https://en.wikipedia.org/wiki/Megali_Idea)