Eastern Slav Republic is a fictional country from the Resident Evil/Biohazard series of games.
Earlier in the comment they say “I think RE Damnation perfectly shows how effective they are.” Resident Evil Damnation was a 2012 Resident Evil film set largely in the Eastern Slav Republic.
This is just some gamer wanking about how much better the US is than generic fictional eastern European country number 42069 from their heckin’ video gamerinos. May as well compare the US’ arsenal to Atlantis’.
ETA: commenter is also full of shit about how well America’d do 'cos the majority of the Resident Evil series is BOW attacks on US soil with huge death tolls. Multiple American cities get nuked partly to stop the spread of this-or-that virus.
I haven’t watched it either, so don’t know if it’s any good.