I was playing in a tournament of 90 people. Online pokerstars
Got down to the final 4. My last three opponents were Russian.

And i noticed they stopped raising each other. I took out one of the guys. but the final two, i couldn't get over.
It was a bit frustrating knowing they were doing that. And sure enough they celebrated when I was out.

Were they breaking any rule?

(these were micro stakes so i dont really care much )