South Sudan's vice president will visit Khartoum next week, Sudanese state media said on Thursday, marking the highest-level talks since Sudan threatened to cut off cross-border oil flows almost two weeks ago. _0"> Bilateral ties hit a new low this month when Sudan said it would halt oil exports that pass through Sudan for shipment abroad within 60 days unless Juba gave up support for rebels operating across the shared border. Juba denies the claims. Since then, the African Union has been trying to defuse the situation, hoping a relative peace will hold between the neighbors, which split in 2011. The two, which fought decades of civil wars that ended in 2005, came close to war in April 2012 when tensions over oil pipeline fees and disputed territory escalated. Both countries agreed South Sudanese Vice President Riek Machar will visit Sudan in one week, state news agency SUNA said, citing the Foreign Ministry. His trip had been planned for Sunday, but was delayed bec