When Russians thank somebody, they say “Спасибо!” (“Spasibo!”) which means “Thank you!”. You can also thank somebody by saying “Благодарю!”(“Blagodaryu!”) which also means “Thank you!”. “Thanks a lot!” or “Thank you very much!” means “Большое спасибо!” (“Bolshoye spasibo!”). Or you can change the order of these words and say “Спасибо большое!” (“Spasibo bolshoye!”) or “Огромное спасибо!” (“Ogromnoye spasibo!”).