Report urges sanctions against Sudan ruling party

* Sudan's UN envoy says Darfur activists are "war mongers"

* U.S. urged to push China to pressure Khartoum

By Louis Charbonneau

UNITED NATIONS, Nov 30 (Reuters) - The United States and other world powers should impose sanctions on key members of the Sudanese government for refusing to end violence in Darfur and south Sudan, a report by an anti-genocide group said on Monday.

Sudan's U.N. Ambassador Abdalmahmoud Abdalhaleem reacted angrily to the report, calling the Enough Project, a Washington-based anti-genocide group, "war mongers."

The Enough Project's report said there was a risk of a new civil war and warned that nationwide elections next year and a 2011 referendum on whether the oil-rich and semi-autonomous south should secede from the Khartoum-led north would not be free and fair.

The report placed the bulk of the blame on the ruling National Congress Party (NCP) of Sudanese President Omar Hassan al-Bashir, who was indicted in March by the International Criminal Court for suspected war crimes in Sudan's remote western region of Darfur. The report called for sanctions.

"Without a firm response from the international community, led by the United States, full-scale nationwide war is inevitable," said the report, written by Enough Project co-founder and former U.S. State Department and National Security Council official John Prendergast.

"This should involve a special outreach effort to China because of the vulnerability of its oil investments should war resume in the South," the report said. "The United States must, then, organize and lead a multilateral diplomatic surge in Sudan aimed at negotiating and consolidating national peace."