
He spoke Russian to him.
According to the person’s description,
Money Heist Season 1, Episode 8

We came a-across
a-a Russian paper
The Big Bang Theory Season 12, Episode 10

lonely Russian cosmonaut
who is expert at physics
The Big Bang Theory Season 12, Episode 5

Haven't you ever been told
how beautiful you are in flawless Russian?
The Big Bang Theory Season 1, Episode 2