My observations/ideas for changing Russia's spawn date, flip zone, and the cities present for the northeastern area, because I have been reading a book on Russian history

(play testing too!). If the spawn date isn't changed, then I think Beloozero should flip to Moscow. I understand the reasoning for having Russia's spawn at 1380 because the Battle of Kulikovo was very important, but I think it could be moved earlier. There are equally important events that lead up to his battle. Here's a hastily constructed timeline of early Moscow.
Russia's early timeline:
Novgorod is fairly solid by Moscow's spawn with their cramped city placement, and the first UHV goal makes it difficult to conquer them at the same time. I think they need more time to consolidate, unless the first UHV will be changed.
Flip zone: I think Smolensk should be removed from Moscow's flip zone entirely, but the iron tile and the rest eastward should be flipped to leave the remaining tiles open for a settler to found a city if desired. However, I am fine with Yaroslavl flipping regardless of the spawn date.
Moscow didn't gain control of Murom until 1393, and Nizhny Novgorod during Vasily I's reign. But I am hesitant to remove those two spots entirely from the flip zone. Usually when playing as Moscow, Nizhny Novgorod flips with a single crossbowman, so that isn't difficult to conquer. I would imagine Murom being set up similarly, but that does remove space for the player to freely settle as desired. I think this is more accurate, and a good trade off for the earlier spawn date.
These are the overall changes I prefer, but this is my opinion:
1. Move Moscow's spawn to an earlier date; preferably between 1325 and 1331 AD to represent Vladimir being eclipsed by Moscow. That would give up to 18 extra turns to consolidate under the current timeline (27.5 under a new timeline).
2. Reduce Moscow's flip zone so that Smolensk, Nizhny Novgorod, the Tver area, and possibly Murom's location remain independent.
3. Add an independent city spawn of Tver in 1246. This would represent that independent principality, reduce some direct space between Moscow and Novgorod, as well as take some territory from Novgorod to help break up their typical grid pattern of cities.
Optional: add an independent city of Murom in 1127 (between the honey resource and gems resource). I would suggest a very small defensive unit, like a single crossbow unit.
Optional: the city of Vladimir could spawn and become a town improvement before Moscow's spawn. This would be handy for a potential "Golden Horde" civ.
Optional: add an independent city spawn of Ryazan on the SW outer bend of the River. They remained independent from Moscow until 1521, so I believe they will be a decent obstacle/barrier so Moscow doesn't expand south very early.
Independent city spawns
Miscellaneous observations: Scotland had a catholic missionary unit hanging out in Finland. Not sure how it got there. I also just noticed the feature when you have a settler selected, it shows you the city name of the tile your cursor is hovering over. That's amazing! It really is the simpler things in life...