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“If they are talking about aerial bombardments, that is not right,” Alobeid Murawih said in a phone interview.

“It is not true that we have declared war against South Sudan,” he added. “We are still defending ourselves and taking necessary measures to push foreign troops out of our country and deal with the rebels from South Sudan.”

Mr. Murawih said the Sudanese armed forces are in full control of Heglig after a battle in which more than 1,000 soldiers from the South were killed.

South Sudanese officials refuted such claims.

“We withdrew from Heglig because we didn’t want to see a return to war with Sudan,” said Agnes Oswaha, South Sudan’s top diplomat at the United Nations. “Our decision was an act of peace.”

Both Sudan and South Sudan claim Heglig.

In 2009, the Permanent Court of Arbitration, an international organization based in The Hague, determined that Heglig was not part of the disputed border area of Abyei.

“It is a common misperception that The Hague decision said Heglig is part of the north,” said Jonathan Temin, director of the Sudan program at the United States Institute of Peace.

“Heglig is subject to the north-south border demarcation process,” he added.

South Sudanese officials, who refer to Heglig as Panthou, say it belongs to the South and that Sudan staked its claim to the region only after oil was discovered there in the 1980s.

A State Department official declined to say whether the Obama administration recognizes Heglig as disputed territory.

“The United States recognizes that Sudan and South Sudan have not finalized the number and size of disputed areas along their shared border,” said the official, who spoke on background.

“There is a mechanism to resolve these disputes through negotiations through the African Union High-level Implementation Panel processes.”

In Beijing, Mr. Kiir sought to win Chinese investment in an oil pipeline that would allow South Sudan to end its dependence on infrastructure in Sudan.

In January, South Sudan stopped the flow of oil from its oil fields to refineries in Sudan after a dispute about payments to Khartoum. This decision deprived South Sudan of 98 percent of its revenue; Sudan lost 95 percent.

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