Minister of Information Michael Makuei told the Associated Press that December 15 was the expiration date for the deployment of peacekeepers to bolster the existing 12,000 UN troops in South Sudan. He said a new resolution is needed for the additional troops.
The UN mission in South Sudan responded in a statement saying that its mandate to increase the protection force had been extended by the Security Council until December 2017.
The UN Security Council decided in August to send additional peacekeepers after clashes killed hundreds in South Sudan's capital Juba. South Sudan initially objected to the force and has delayed its deployment.
South Sudan's civil war began in December 2013 and has killed tens of thousands of people.
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Makuei also announced today that President Salva Kiir created four new states in South Sudan bringing the total number to 32.
"It is the will of the people," Makuei said of the move. Kiir had already increased South Sudan's states from 10 to 28 in December 2015, a move that was criticised by opposition forces who claimed that the new states were a form of political gerrymandering.
The UN says South Sudan is experiencing ethnic cleansing and is at risk of genocide.
"The proliferation of states actually increases central power," said Alan Boswell, a researcher on South Sudan based in Nairobi. "Kiir can offer new states in complex political negotiations with local communities to lure or divide them.