Secretary-General Kofi Annan warned that U.N. peacekeepers face an "alarming situation" in the tense Ethiopia-Eritrean border area following Eritrean restrictions on their movements and urged the Security Council to take action to prevent another war. The council was scheduled to meet Wednesday afternoon to discuss the dispute between the Horn of Africa neighbors, which fought a 2 1/2-year border war that ended in a December 2000 peace agreement.Greece's U.N. Ambassador Adamantios Vassilakis said he plans to circulate a draft resolution calling for Eritrea to lift its ban on helicopter flights and vehicle movements and both countries to start discussions on their disputed border.