Having journalist covering the imperialist ambitions of Russia, who are behaving like the Nazis of old, by capturing parts of other countries based on a common language, seems desirable. However, "journalist" seem like a misnomer here - it seems he worked as a war-photographer.
There is a story about Belarussian recruit "Kim" in Donbass fighting for Azov cited, it's just that "Kim" and Prostasevich seem to be different persons.
False accusations of fascism and nazism from the former Soviet Russia (of which Belorussia was a part) is as old as the 1930s (part of the background for 1984 and The Animal Farm); and apart from not being visible earlier (the public case against him for participating in that fighting was opened two days ago) it's not clear what the new alleged neo-Nazism has to do with his earlier kidnapping by the terrorist state Belarus that hijacked a plane between two EU-countries.
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Close enough, and Google translate says it is Bulgarian.
Russian: Соединенные Социалистические Штаты Америки
Ukrainian: Об'єднані соціалістичні штати Америки
(eastern Slavic languages)
Macedonian: Обединети социјалистички држави на Америка
Bulgarian: Обединени социалистически щати на Америка
(eastern dialects of South group)