AHC/WI: Russo-Prussian, and/or Russo-German Union?

An improbable post in After-1900 got me thinking and I couldn't find anything in search or on Google, so...

1, Challenge: With a POD after 1700 and before 1871 give me a scenario or group of scenarios in which Russia and Prussia and/or Russia and Germany are united in a full political union. Preferably the latter, but it can at least begin with the former.

Bonus points for a Hohenzollern-Romanov dynasty, of course.

2. Please provide your opinion on the effects and future of such a Union in history. Surely there will be a succession war, but I want the Union to win obviously.

Cultural, military, linguistic, etc.

Let me hear ya.
 
An improbable post in After-1900 got me thinking and I couldn't find anything in search or on Google, so...

1, Challenge: With a POD after 1700 and before 1871 give me a scenario or group of scenarios in which Russia and Prussia and/or Russia and Germany are united in a full political union. Preferably the latter, but it can at least begin with the former.

Bonus points for a Hohenzollern-Romanov dynasty, of course.

2. Please provide your opinion on the effects and future of such a Union in history. Surely there will be a succession war, but I want the Union to win obviously.

Cultural, military, linguistic, etc.

Let me hear ya.

Just have Frederick William I of Prussia marry Grand Duchess Anna Petrovna of Russia but I doubt if Prussia still unites Germany ITTL, which means his OTL wife dies earlier and does not have a son with his previous spouse and most likely that son might convert to Catholicism if the want to rule Poland or Poland will most likely go to the Wettins, Habsburgs or the Bourbons.
 
An improbable post in After-1900 got me thinking and I couldn't find anything in search or on Google, so...

1, Challenge: With a POD after 1700 and before 1871 give me a scenario or group of scenarios in which Russia and Prussia and/or Russia and Germany are united in a full political union. Preferably the latter, but it can at least begin with the former.

Bonus points for a Hohenzollern-Romanov dynasty, of course.

2. Please provide your opinion on the effects and future of such a Union in history. Surely there will be a succession war, but I want the Union to win obviously.

Cultural, military, linguistic, etc.

Let me hear ya.

I see what you did here
 
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