This guide help you learn some russian words
Hello = Privet dayni ! (agresive) or Zdarova parni ! (friendly)
Eco = go EKO
If your teammate buy a weapon on eco round = Ti syka dolbayeb? or Nahyi kypil eko je
Damn = Syka or Blyat
Give me drop please = Dropni (Put name of weapon here)
M4A1-S or M4A4 = mka
AWP = awapa
Drop Bomb = dropai bomby
Good Work m8 = prosto bat'ka or molodec
Losers = Raki Syka
Loser = dniwe or krivorykiu
Pro = bat'ka or bog
Fager = ♥♥♥♥♥♥♥
You! Plant bomb! = Plenti dayn!
P90 = Petuh
If somebody in enemy team go SCAR-20 or P90 = OMG dayn so skorostrelkoi or Petuh ebaniu
Throw flash = Kidai fleshky!
Throw fire = Kidai ogon'!
Throw smoke = Kidai Dim!
Take hostage = Beri zalozhnika!
Defuse the bomb = Defuz

I think if should help you