Mercedes racer Russell, who was handed a three-place grid penalty for blocking Charles Leclerc during Saturday qualifying to line up 11th, attempted to pass Piastri for seventh on lap three of 19.
He eventually made the move stick with a superior burst of acceleration out of Turn 18 but ran with all four wheels straying beyond the white lines defining track limits on corner exit.
For this, Russell was handed a five-second penalty and ultimately lost a place at the flag to finish eighth.
Piastri, who finished 10th, said there was no case to argue that it was a 50:50 incident and that Russell was bang to rights. He said: “I wasn't really looking at him because he was behind me.
“I've seen the replay of it and clearly, he just accelerates off the track and goes past so I don't think you can get close to arguing that was a 50:50.
“The five seconds made a bit of a difference to his race but not much. That’s the kind of thing you can do with faster cars, or when you're in a faster car in a situation like that. I don't think it's great for everyone.”
Source: Autosport