Military Aide of Syria's Assad Is Reported to Have Defected BEIRUT, Lebanon - Manaf Tlass, a general in Syria's elite Republican Guards and a member of the Damascus aristocracy who grew up around President Bashar al-Assad, was reported to have defected on Thursday. If confirmed, it would be the first such desertion from within the gilded circle around the president since the uprising against him began in March 2011, and the kind of embarrassing departure long anticipated to indicate that the regime's cohesion was cracking. "Manaf is one of the regime's main figures," said Bashar al-Heraki, a member of the Syrian National Council, the main political group in exile. Mr. Heraki, the head of the council's military liaison committee, said General Tlass would soon publicly declare his defection, but he declined to confirm reports that the general was in Turkey. "It is a negative sign for this regime, it has started to lose control," Mr. Heraki said. The directorof the Britain-based Syrian Observatory for Human Rights, an opposition group with contacts inside Syria, said at least three people within the country had confirmed that General Tlass had left, but it was not completely certain that he had defected. "If he does announce it, it will be the first real defection from the regime," said the director, who goes by the pseudonym Rami Abdul-Rahman for reasons of personal safety. General Tlass was the son of another general, Mustafa Tlass, who was a close confidante of President Hafez al-Assad, father of the current president. Mustafa Tlass served as his defense minister from 1972 to 2004. As one of the regime's most prominent Sunni Muslims, he helped disguise the fact that the elder Mr. Assad built an inner circle composed mostly of his own minority Alawite sect. The elder Mr. Tlass was also said to have played a key role in the anointment of Bashar al-Assad as his father's heir after his firstborn son, Basil, died at the wheel of his Mercedes. At the official memorial service for Basil, the elder Mr. Tlass said from the podium that he could see the light of Basil's eyes shining from Bashar's. Bashar soon became the heir-apparent, ending his medical career and sent for military training where the elder Mr. Tlass quickly promoted him and where he became friends with Manaf. In the second generation of the elite, families with two sons often divided their roles, with one going into business and the other joining the armed forces. It was true of Bashar's first cousins, the Makloufs, and it was also true for the Tlass family. Firas Tlass became a business tycoon, while Manaf, a handsome, charismatic figure, became an officer in the Republican Guards, one of the elite units that has been used repeatedly to try to crush the rebellion by force. "He's a close friend to Bashar," said Mr. Heraki, "So it is not only a strong strike against the regime, but the strongest message yet to Bashar that he is no longer safe, and message to other officers thinking about defecting." Word of General Tlass's reported defection came as the officer commanding United Nations monitors in Syria said that violence there had reached "unprecedented" levels, making it impossible for his unarmed observers to resume their work, which was suspended last month. The suspension was one of the most severe blows to months of international efforts to negotiate a peace plan to forestall a descent into civil war. It would be impossible to revive his mission without a cease-fire, General Mood said. But, in the third installment of an interview which Turkey's Cumhuriyet newspaper has published this week, Mr. Assad showed no readiness to heed either cease-fire calls or a plan proposed by Kofi Annan, the special envoy on Syria, for a transitional government. Neil MacFarquhar reported from Beirut and Alan Cowell from London. Reporting was contributed by Dalal Mawad from Beirut, Sebnem Arsu from Istanbul, Turkey, and Rick Gladstone from New York.