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epa10428293 A spectator wears a 'Z' on his t-shirt as Novak Djokovic of Serbia takes on Andrey Rublev of Russia during their quarterfinal match at the 2023 Australian Open tennis tournament in Melbourne, Australia, 25 January 2023. The letter Z, painted on Russian military vehicles in Ukraine, has become a symbol of support for the Russian army. EPA/JAMES ROSS AUSTRALIA AND NEW ZEALAND OUT