Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. February 10, 2012 Sudan, South Sudan Sign Treaty of Non-Aggression VOA News Sudan and South Sudan have signed a border security agreement that aims to defuse growing tensions over oil revenue payments. The chief negotiator, former South African President Thabo Mbeki, said Sudan and South Sudan signed the non-aggression pact Friday during a meeting in the Ethiopian capital Addis Ababa. Details of the pact were not immediately available. When South Sudan seceded in July of last year, it took most of the region's oil fields, but the oil from the landlocked country must transit Sudan to reach ports. Juba last month halted its production after Khartoum started seizing southern oil as compensation for what it calls unpaid transit fees. Earlier Friday, natural resource monitoring group Global Witness expressed concern about escalating tensions between the two sides. Sudan wants South Sudan to pay transit fees of more than $30 per barrel. The industry standard is closer to $1 per barrel. Tensions have also remained high over disagreements about how to demarcate the border, and accusations that each side is arming the other's rebel groups. The dispute has hurt both economies. More than 90 percent of South Sudan's revenues are derived from oil exports. Sudan is said to have lost more than $7 billion when the South gained independence. On Thursday, South Sudan announced an agreement with Ethiopia allowing it to build an oil pipeline through Ethiopia to the port of Djibouti. Some information for this report was provided by AFP. .