Toperich then transitioned to diplomacy. The President of Bosnia and Herzegovina appointed Toperich as Presidential Envoy of Bosnia and Herzegovina to the United States in 2003, holding a rank equivalent to Ambassador. In 2006, he became the first high-ranking diplomat from Bosnia and Herzegovina to officially visit Baghdad after fall of Saddam Hussein. From 2009 -2010, Toperich served as a Counsellor at the Permanent Mission of Bosnia and Herzegovina to the United Nations, with mandate over the country's successful bid to join the United Nations Security Council as a non-permanent member for a two-year term.
