Eritrea declined, saying troops must leave border, and in February the UN began pulling out the 1,700-strong peacekeeper force due to lack of fuel supplies following Eritrean government restrictions. In April, UN Secretary-General Ban Ki Moon warned of the likelihood of new war between Ethiopia and Eritrea if peacekeeping mission is withdrawn completely, and outlines options for the future of the UN mission in the two countries. In May, Eritrea called on UN to terminate the peacekeeping mission.[6]