The "sovereign citizen" in Russia seem to believe that they are citizens of the Soviet Union, funnily enough:

A Russian movement of conspiracy theorists, known among other names as the Union of Slavic Forces of Russia (Soyuz slavyanskikh sil Rusi), or more informally as "Soviet Citizens", holds that the Soviet Union still exists de jure and that the current Russian government and legislation are thus illegitimate. One of its beliefs is that the government of the Russian Federation is an offshore company through which the United States illegally controls the country.

https://en.wikipedia.org/wiki/Sovereign_citizen_movement#Russia

Every country seems to have their share of those crackpots. In Germany they think pretty much the same, except it's the Reich (the WW1 one) that's still totally real.