Bit of an update: After checking Wikipedia's Unicode list, I can reasonably conclude every single letter would actually use Cyrillic characters, allowing this to be cracked much easier. Even better, this seems to only use standard, non-archaic characters, which means the cipher is what seems to be in a language like modern Russian, Belarusian, Ukrainian, Kazakh, or essentially any nation near or under control of the Soviet Union. I'm going to stand by my idea of this either being a simple substitution/Caesar cipher, where a letter is simply replaced with another one depending on a certain variable, a Vigenere, which does actually allow my theory of "p=23" being a key to be correct. This should either take forever, or a few days for someone out there to crack if they were so determined.