Most of the southern half of the boundary with Somalia is a Provisional Administrative Line; as a result of the 12 December 2000 peace agreement ending a two year war with Eritrea, the UN will administer a 25-km wide temporary security zone within Eritrea until a joint boundary commission delimits and demarcates a final boundary; dispute over alignment of boundary with Eritrea led to armed conflict in 1998; a peace accord signed in December 2000 provides for UN-assisted arbitration and demarcation of the border