Ukraine said it shot down three Russian warplanes in one of its most-successful operations against Russian air power since the start of the war. Ukraine’s Air Force said the three Russian Su-34 fighter-bombers were downed around midday Friday in the south of the country. There Russia has used the jets to launch cruise missiles and guided bombs against Ukrainian-held cities on the western bank of the Dnipro River and Ukrainian soldiers who have established a foothold on the eastern side. Russian officials didn’t immediately comment, but Russian war bloggers close to the Kremlin acknowledged the losses and said they could...