UNITED Nations Secretary-General Kofi Annan is expected in Dakar on Tuesday night on a three-day visit to Senegal, the first stage of an African tour which will take him to five other countries. Annan, accompanied by his wife, will also visit Guinea, Sierra Leone, Liberia, Nigeria and Algeria, which is hosting the annual OAU summit from 12 to 14 July. Since his election, Annan has continually expressed his desire to establish dialogue with states on the best way to use UN instruments to ensure peacekeeping, promote preventive diplomacy and strengthen peace after conflicts.