From a March 6, 2012 press release by the UN Security Council:
Gravely concerned by reports of violent cross-border clashes between Sudan and South Sudan, the Security Council today demanded that all parties, including proxy forces, cease all military operations in the border areas and put an end to the cycle of violence.
Through a wide-ranging statement read out by its President, Mark Lyall Grant (United Kingdom), the Council, concerned about reported “troop movements, support to proxy forces, and aerial bombardments”, strongly urged the Governments of Sudan and South Sudan to reach agreement on the status of disputed border areas and to agree on and swiftly implement a process and timeline for border demarcation under the facilitation of the African Union High-Level Implementation Panel (AUHIP).
Condemning actions by any armed group aimed at the forced overthrow of the Government of either Sudan or South Sudan, the Council also demanded that the two Governments “take no action that would undermine the security and stability of the other, including through any direct or indirect form of support to armed groups in the other’s territory”. It urged Sudan and South Sudan — which split following a referendum in 2011 — to “implement and respect the letter and spirit” of their 10 February Memorandum of Understanding on Non-Aggression and Cooperation.