Ukraine's ambassador to Australia has called for Novak Djokovic's father to be banned from the Australian Open after he was seen posing with fans waving Russian flags. The ambassador also demanded that Djokovic apologize and denounce Russia's invasion of Ukraine. A video posted to a pro-Russian Australian YouTube account showed Djokovic's father posing with a man holding a Russian flag with Vladimir Putin's face on it. Tournament organizer Tennis Australia said it would work with security to enforce admission regulations.