By 2010, Croatia and Serbia further improved their relations through an agreement to resolve remaining refugee issues, and visits of Croatian President Ivo Josipović to Belgrade, and of the Serbian President Boris Tadić to Zagreb and Vukovar. During their meeting in Vukovar, President Tadić gave a statement expressing his "apology and regret", while President Josipović said "that no crimes committed at the time would go unpunished." The statements were made during a joint visit to the Ovčara memorial center, site of the Vukovar massacre.