Thanks, I'll try to ponder if temporarily weakening Muscovy could give Novgorod some breathing space. Mind you, I'm not trying to do a wank. It can loose some of its territory, but I'm more interested in it surviving at all.
And I'm interested in making Russia a bit more fractured and less Moscow-dominated than in OTL anyway.
The civil war you mentioned seems the only non-ASB option. Tatars conquering the place is a little far-fetched and wouldn't suit my plans for the TL.
You are welcome, but if you want Russia to exist but to be less
dominated by Muscovy in my opinion the only chance is earlier PoD.
Since middle XIV Muscovy is "unite Russia or die". Muscovian
conquest of North Eastern Russia ( including Novgorod) can be
prevented only by destruction of Muscovy and that means( in XVth
century or later) the destruction of any Russian state.
If I were you I would try earlier( at least before Dmitry Donskoy)
PoD and Russia united by some other principality( say Tver or
Ryazan). But I believe that either this state will be as centrilazed
as Muscovy or it will be absorbed by it's neighbors- Northern
Eastern Russia is a very poor place with unfertile earth very little
resources except forests which are not in deficit before 17th-18th
centuries. In fact all late Middle Ages are very russowank( or
muscovy wank if you prefer ). Russia was surrounded by several
neighbors stronger both in economical and demographical ways. It
could survive only because EVERY single Muscovian prince since XIII
century was at least better than average, because Muscovy was fully
centralized and could develop pomestye system( in which evere singe
noble was fighting 6-9 month a year)- a medieval form of total
mobilization. Without these factors I believe any state consisting
only of Northern Eastern Russian principalities is doomed.
So any other Russian principalities should become very Moscowlike or
will be destroyed and the only good alternative of Russia is
Lithuania. In fact GDoL was a Russian speaking state and if it
conquers Muscovy and other principalities it can provide an
excellent possibility for non Moscowlike Russia.
Other good possibility has yet more earlier PoD ( but it's still
post Mongol). This alternative is Bryansk-Chernigov principality. It
was quite strong but was destroyed by Toqta forces because it was
allied to Nogai. So if you make it ally with Toqta instead or make
Nogai win the struggle you get another center of power in Russia. If
you are interested in this alternative I can send you a book on
Bryansk principality( but that's in Russian, sorry).