The U.N. representative to South Sudan is asking the country to repatriate diverted funds.
Hilde F. Johnson told a news conference on Wednesday that hundreds of millions of dollars meant for South Sudan's government have been wired to private bank accounts abroad. She called such acts unacceptable.
Johnson lauded South Sudan President Salva Kiir for announcing at U.N. headquarters that steps were being taken to end impunity for perpetrators.
South Sudan broke away from Sudan in July to become the world's newest nation.
Violence in the new country this year already has killed 3,000 people. More than 300,000 others have been displaced by fighting.