Ethiopia and Eritrea traded blame for the rising tensions along their shared border on Friday, but vowed not to ignite another war, the United Nations said on Saturday. Military commanders from the two countries met in the Kenyan capital, Nairobi, at UN-hosted talks amid growing concern that their border stalemate could lead to renewed conflict. The closed-door talks were held two days after the UN Security Council threatened to impose sanctions against the two countries if they continued to engage in activities that aggravated the border standoff.