Russian gymnast Ivan Kuliak wore a “Z” on his uniform in apparent support of Russian troops at a competition last week. The 20-year-old from Kaluga, Russia, took home the bronze medal in parallel bars at the Apparatus World Cup in Doha, Qatar — an event in which Ukranian Illia Kovtun won first place — and could be seen with the “Z” on his chest on the podium. “Z” has emerged as a way for Russian politicians, influencers and activists to show support for Vladimir Putin and Russia’s invasion of Ukraine. The Latin insignia has been seen on tanks and other...