Some progress has been done here:
Russia
the Baltic lands, Galicia and Volhynia still need to be worked out a little, also the area between Caucasus and azov/Tana, but generaly I think this should be final version of the core russian lands.
So now, I hope I can fully work on my RL
PS: notes to the northern part:
R - Rostov
Per - Pereyaslavl (other than souther one, but no specification found
)
D - Dimitrov
The province that might be hard to read is Volokolamsk
Russia

the Baltic lands, Galicia and Volhynia still need to be worked out a little, also the area between Caucasus and azov/Tana, but generaly I think this should be final version of the core russian lands.
So now, I hope I can fully work on my RL
PS: notes to the northern part:
R - Rostov
Per - Pereyaslavl (other than souther one, but no specification found
D - Dimitrov
The province that might be hard to read is Volokolamsk