Its the Flag of the Donetsk People's Republic, One of the regions that separated from the rest of Ukraine after the Maidan coup. Because that's where the majority of the Russian first language minority(who make up 1/3 of Ukraine's population) lived, after the Kyiv regime discriminated against them(banning their language in schools etc) and the Nazi battalions like Azov were shelling their residential areas(this is all prior to the 2022 russian 'SMO'), it was later eventually officially annexed into the Russian federation along with the Luhansk People's Republic

Its a Russian tricolour with the text:

ДОНЕЦКАЯ (Donetskaya) – Donetsk

РЕСПУБЛИКА (Respublika) – Republic

And the double headed eagle is a symbol of the pre-soviet Russian empire

[–] Johnny_Arson@hexbear.net 17 points 1 month ago

That one always throws me off because the black on top and red on bottom I thought at first it was one of the blood and soil flags.

[–] SwitchyandWitchy@hexbear.net 8 points 1 month ago

Thank you, I thought it was something like that but I got confused when I read Johnny_Arson's comment.

[–] jack@hexbear.net 4 points 1 month ago

that's where the majority of the Russian first language minority

Just a phrasing clarification so nobody gets mixed up. The breakaway republics are not hte majority of the Russian language minority, but they are the most Russian of any regions of the country (because it's actually just a gradient from west to east on a spectrum and the line between Russia and Ukraine is fake)