Russian tennis star Andrey Rublev had a simple, yet powerful message as his country and Ukraine collide on the world stage ... writing "no war please" on a camera following his match in Dubai.
Andrey -- the world's No.7 ranked tennis player -- knocked off his opponent, Hubert Hurkacz, on Friday ... and then made his mark for all to see.
Rublev spoke more in-depth about the conflict after the match ... saying, "You realize how important it is to have peace in the world and to respect each other no matter what, to be united.