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Mr. Mohamed, the Sudanese ambassador, complained about Mr. Obama’s decision to single out the north.

“What we see from the U.S., to put pressure on one side, that will not help,” he said.

“The U.S. must also hold the other side [the south] accountable for violations in Southern Kordofan and Abyei,” he added.

Southern leaders previously had alerted the international community to the violence in Southern Kordofan; however, these concerns were not taken seriously until Mr. Obama made his comments on Tuesday, Mr. Machar said.

“We want two feasible states to coexist side by side. This is not possible if there is war,” he added.

According to Sudan Now, a group of anti-genocide and human rights organizations, an undeclared war already has begun between the north and the south.

“The war between North and South Sudan has resumed due to the offensive military operations launched by Khartoum,” said John Prendergast, co-founder of the Enough Project.

Mr. Obama said both sides must end the violence, allow the free movement of aid workers and relief supplies, and fulfill their commitments under the Comprehensive Peace Agreement to resolve their differences peacefully.

The agreement in 2005 ended two decades of civil war that killed an estimated 2 million people.

Mr. Obama reminded Sudanese leaders that, if they fulfill these obligations, the U.S. will take the steps it has promised toward normal relations with Khartoum.

“However, those who flout their international obligations will face more pressure and isolation, and they will be held accountable for their actions,” he added.

Mr. Prendergast said the policy of offering incentives to the Sudanese government has failed.

The U.N. Refugee Agency, meanwhile, called on local and central authorities to allow air and road access for humanitarian agencies working with displaced people in Kadugli, the capital of Southern Kordofan.

Melissa Fleming, the agency’s chief spokeswoman, said armed militiamen have set up roadblocks and are blocking the agency’s access to crucial supplies and displaced persons.