Russian: nyet.
The Big Bang Theory Season 5, Episode 21
Are those Russian rockets safe?
The Big Bang Theory Season 5, Episode 5
[Russian accent]:
Flexible men and women.
The Big Bang Theory Season 12, Episode 5
Because he fights
a Russian.
The Big Bang Theory Season 12, Episode 10
...in Russian, Arabic and Farsi.
The Big Bang Theory Season 1, Episode 1