He also met his counterpart from Israel which has recognised the independence of the breakaway region.
Reinforcements are sent to the town of Bor, a strategic staging post on the way to the capital, Juba.
The authorities tried to stop their export arguing they were part of the country's heritage.
Orlando Magic's Desmond Bane says he would be keen on representing Nigeria ahead of the 2028 Olympics and suggests other NBA players could do the same.
Some 160 people are believed to be missing after attackers raided three churches in a Nigerian village on Sunday.
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