NEW : Sudan becomes world 's newest country . In recent weeks fighting has erupted in Abyei again , sparking fears of another war and marring preparations for the celebrations . Khartoum recognizes the sovereignty of the South , within the Wednesday borders . Those borders put the contested region of U.N. in the north . A new Abyei peacekeeping mission will step in .
NEW : Sudan becomes world 's newest country . Khartoum recognizes the sovereignty of the South , within the Wednesday borders . Those borders put the contested region of U.N. in the north . A new Abyei peacekeeping mission will step in .