Sudanese President Omar al-Bashir says his government will allow South Sudan to export its oil through northern pipelines and the Red Sea port city of Port Sudan.

"The agreements we signed call for the transport of South Sudan's oil through Sudan's facilities and ports," Bashir said at the end of a one-day summit with his South Sudanese counterpart, Salva Kiir, in Khartoum on Tuesday.

Earlier, Khartoum had threatened to shut down its southern neighbor’s oil pipelines from September 6, unless Juba gave up support for rebels opposed to Sudan’s rule.

South Sudan’s oil exports are the only source of foreign revenues for the land-locked state.

"We are now taking new steps," Bashir told the summit, stressing his country's determination to have good relations with South Sudan.

"We respect all the agreements... and are committed to implementing them as one package," he said.

Bashir greeted Kiir on the Khartoum airport tarmac. According to Sudan's Foreign Minister Ali Karti, the visit came at Bashir's invitation.

The South's leader last visited Khartoum in October 2011, a few months after the South declared independence under a peace deal that ended a 23-year civil war.