In the Last Game Mother Russia was able to sucessfully annex Ukraine, as well as fight off the massive Invasion from "Eastern Russia" (the Ljos) and eventually invade the Western nations.
See, the tricky thing about the three Western Nations is that Norway immediately Vassalized to me, and so Heterodyne and Amur, the Sciency Western Nations akin to France and Germany, were at the strategic disadvantage. Partially this was because Germany (Heterodyne) had troops stationed in Norway ready to flank me, that got kicked back into his home territory once I declared on him.
So then, I invaded france (Amut), directly into the Marginot Line. I had a massive army, although the line stalled me immensely. The Marginot line consisted of a combination of Arcane Lacuna, Charm Spells, and a Beefed up Saverous.
Although the line stopped my main forces, it did not stop my high quality KGB spies from killing off the French Mad Scientists. Eventually my spies killed so many scientists, the Marginot line could no longer stall me with the Charm spell.
As France's future was deemed in Peril, and the French leader was too weak willed to offer a resistance to allow Germany and Italy to launch a counter offensive, France capitulated to Russia, and sealed the fate of the game.
In the end, a combination of Russian Mad-Scientists, Russian Revanents, and Russian Super-spies won the day. Although, it is funny that all of the Western Nations surrendered before actually giving a full fight. I hadn't even taken one western city before winning the day completely.
Why? Because I had two vassals who flanked my only chances for defeat.
Still, I must say that the battle for Russia ... Western Russia fighting off a suprise Invasion of Eastern Russia, was quite the most amusing and entertaining battle. I really, really love fighting off an invasion of Treants, especially with the Nox Noctis. I think Eastern Russia's goal was to either Destroy or Annex the Nox Noctis. Unfortunately for him, the Royal Guards of Western Russia were more than ready for the task. As well as the Mad-Scientists conjuring foul beasts on the edges of my borders.