CHICAGO — In a display of solidarity with Ukraine, former Presidents George W. Bush and Bill Clinton earlier this week left bouquets of sunflowers, the war-torn nation’s national flower, at an iconic church in Chicago’s Ukrainian Village during an unannounced visit. Both former presidents, who have been outspoken in opposing Russia’s invasion of Ukraine, used social media late Friday to post videos of their joint visit to the golden-domed Sts. Volodymyr and Olha Ukrainian Catholic Church, 739 N. Oakley Blvd. The men, both 75, wore yellow ribbons on their suit lapels as they approached the chur…