FRANKFURT (Reuters) – Some 10,000 people attended a concert in solidarity with Ukraine in Berlin on Sunday, police said, with the crowd waving Ukrainian flags or holding banners with slogans opposing the Russian invasion. Gathering near the Brandenburg Gate, symbol of a divided Germany during the Cold War, many performers on the stage wore shades of blue and yellow, the colours of the flag. Musicians included Natalia Klitschko, a Ukrainian singer who is married to the mayor of Kyiv, Vitali Klitschko. Jamala, a Ukrainian singer who won the Eurovision Song Contest with her song “1944” in 2016, w…