It's a new twist, but how did this Eastern European Union grab Russia's second-biggest city? The Russians wouldn't be happy, to say the least.
Of course, Eastern Europe being best buds with Russia seems ASBish ATM.
Russia is totally collapsed and disintegrated at this point in the timeline, and has been for a while now.
Some general background: the whole premise of the scenario is that (per my Spenglerian view of history) the latter half of the 21st century will see a big collapse of "the West". Total political and economic failure, which is then followed by autocracy and ultimately an Imperial phase. The twist is that the West isn't analogous to Rome in this version (as most Spenglerians tend to imagine) but is in fact Greece.
Islamic culture is actually Rome's analogue here, and Europe gets co-opted and integrated by it the same way Greece was by the Romans. The Imperial phase sure starts, just as Spengler predicted... but the Empire is actually the Caliphate. (It even has wide hegemony, since the differences between branches of Islam are no more relevant in 2200 than those between Catholics and Protestants in 2018-- as such, Dar al-Islam is unified as a NATO-like alliance, with Paris in the leading role.)
As I've mentioned elsewhere, I'm working on this scenario as one of a set, showing different manifestations of the Spenglerian cycle-- thus demonstrating how different the particulars can be, while the general cycle remains clearly in place. In this version, the "radical right" (for lack of a better world) in the West peaks early, and is thus revealed as populism that offers no solutions. Because it peaks before the democratic states collapse, it is also unable to implement any truly radical measures. Which means that the "alt-right" is basically over (as we know it) by the time the West collapses-- having been supplanted by a wave of neo-socialist populism that offers no real solutions, either. (Because "kill the rich!!!" is no more sensible a position than "kill the foreigners!!!")
This is the backdrop for the collapse. Russia, after Putin, went back to something very much like Yeltsin's government. This was... not good. It only became worse and worse, leading to a neo-communist coup and dictatorship. This fell apart spectacularly, leading to military anarchy. By 2200, we're looking at the last tail-ends of a protracted warlord period. European Russia has mostly re-united, and further east is a group of affiliated states. Plans to re-unite Russia as a truly cohesive entity are thus far tentative, and the current regime is militarist. An enlightened clique of young officers is planning a "National Renewal", however, which might improve things vastly.
During the dark times, when "Russia" was just a bunch of warlords killing each other in the ruins of a failed state, several post-Russian statelets were either absorbed into the nascent Holy Union or joined voluntarily, as Russia itself was nothing more than a memory at that point.
...my apologies, I've written down far more than what you actually asked.
No Germanic neo-pagans? These neonazis seem to have a thing for that. (And I know that not all neo-pagans are nazis, fortunately.)
I think the obsession with neo-paganism among these thugs is nothing but a fad. It goes away when the alt-right burns out. The obsession with "tradition", held by certain reactionaries, turns out to be more lasting. The Holy Union is deeply committed to an arch-reactionary belief system that reject Modernity, and holds the view that the "occupation" of Western Europe is God's punishment for a fallen world. The loony terrorists take that sort of bullshit and run wild with it.