U.S. Presidential candidate Barack Obama met German Chancellor Angela Merkel in Berlin on Thursday for talks on key international issues, reported the DPA. German government spokesman Ulrich Wilhelm described the talks as "very open and in depth," adding they were held in a good atmosphere. The German leader and Obama's talks focused on Iran, Afghanistan and Pakistan as well as the Middle East peace process, Wilhelm said. The Illinois Senator is visiting the German capital to make the key speech of an overseas tour aimed at enhancing his foreign policy credentials for the US electorate.