Dutch Foreign Minister Bert Koenders is to arrive in Tehran tomorrow on a two-day official visit, ISNA reported. Koenders is scheduled to meet President Hassan Rouhani, Foreign Minister Mohammad Javad Zarif and other top-level officials. The trip comes after a string of visits by other senior European officials from countries such as Britain, France, Italy and Spain following the July 14 nuclear deal between Iran and major powers to set the stage for investment and trade.