In the 2022 Russian invasion of Ukraine, the Russian armed forces have adopted the letter Z to mark their vehicles, and many civilians have adopted it to express support for the Russian invasion (see this New York Times article). The Latin letter Z is the standard transcription of the Cyrillic letter З, where Z is supposedly short for за победу, meaning for (the) victory.
Why does Russia use the Latin letter Z rather than the Cyrillic letter З? For a nationalist symbol, it seems odd to use a letter from a script used for foreign languages only.