Given the task definition and input, reply with output. In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

Media playback is unsupported on your device Media caption "To Mr Assad's forces the killing of the rebel commander will be a big symbolic victory", reports James Reynolds 
  
 A top Syrian rebel commander has died of wounds he sustained in an air strike on a rebel-held air base in Aleppo province on Thursday, his group says. 
  
 Abdul Qadir al-Saleh, the leader of Liwa al-Tawhid, died overnight, a spokesman told the Associated Press. 
  
 Liwa al-Tawhid is one of the main rebel forces in Aleppo and is estimated to have between 8,000 and 10,000 fighters. 
  
 Meanwhile, senior figures from the Syrian regime are in Moscow to discuss plans for a peace conference. 
  
 Deputy Foreign Minister Faisal Mekdad led the team, which has been meeting counterparts in the Russian foreign ministry. 
  
 Government advance 
  
 Analysis A year ago, rebels in northern Syria may have had reasonable hope for swift advances against government forces. The Liwa al-Tawhid, an Islamist faction commanded by Abdul Qadir al-Saleh, were leading rebel advances into Aleppo. But in recent months the government has succeeded in taking back lost ground. The government air raid on Aleppo on 14 November was part of a two-week offensive to regain rebel-held areas. Abdul Qadir al-Saleh's death, from injuries sustained in the air raid, deals a symbolic and practical blow to the Liwa al-Tawhid, widely seen as the strongest rebel movement in the region, with more than 8,000 fighters. But the movement will now have to regroup. The Liwa al-Tawhid say they have appointed Abdul Aziz Salama to succeed Abdul Qadir al-Saleh as military commander. 
  
 The Syrian opposition National Coalition told AFP news agency its president had also been invited to visit Moscow at the same time, but had been unable to attend due to prior commitments. 
  
 The United States, Russia and the United Nations are trying to convene the much-postponed conference in Geneva to try to end the civil war. 
  
 Monday's meetings follow a telephone call on Thursday between President Vladimir Putin and Syrian President Bashar al-Assad, which the Kremlin said was their first since Mr Putin returned to the Russian presidency in 2012. 
  
 Liwa al-Tawhid formed in July 2012, uniting many separate fighting groups in the northern Aleppo countryside. Later that month, it led a rebel offensive on the city of Aleppo and took control of several districts. 
  
 In January, Liwa al-Tawhid joined the Syrian Islamic Liberation Front (SILF), an alliance of Islamist groups which mostly recognise the Supreme Military Council of the Free Syrian Army but not the National Coalition. 
  
 Saleh, a former businessman from the town of Marea, had been meeting other senior figures from Liwa al-Tawhid at the time of the air strike. 
  
 Youssef al-Abbas, also known as Abu al-Tayyeb, died soon after the attack. There are conflicting reports about whether he was the brigade's intelligence or financial chief. 
  
 Saleh was meanwhile rushed to a hospital in neighbouring Turkey. The opposition Aleppo News Network reported on Friday that he was in a "good condition". 
  
 As an individual, he was very, very important, certainly in the Aleppo area, but increasingly as an individual that many in Syria felt represented the revolution Charles Lister, IHS Jane's 
  
 However, Saleh's subsequently died and was brought back to Syria for burial, Liwa al-Tawhid and activists confirmed on Monday. 
  
 "We declare the martyrdom of Abdul Qadir al-Saleh," a statement by the brigade said. 
  
 Abdul Aziz Salama, the brigade's political leader, has assumed overall command, the group's spokesman said. 
  
 Liwa al-Tawhid arrested 30 people suspected of being government informers following the strike. 
  
 Counter attack 
  
 "As an individual, he was very, very important, certainly in the Aleppo area, but increasingly as an individual that many in Syria felt represented the revolution," Charles Lister, an analyst at IHS Jane's Terrorism and Insurgency Centre, told the AFP news agency. 
  
 "He came from a humble background, was outwardly religious but was very open... and he maintained extremely good relations with almost all groups of all different natures." 
  
 He said Saleh's death might "spur on the rebels to launch a counter-attack as the regime advances" on opposition-held parts of Aleppo. 
  
 A week ago, Liwa al-Tawhid joined five other rebel groups operating in the city, including the al-Qaeda-affiliated al-Nusra Front, in urging people to "face up to regime attacks". 
  
 Their joint statement said government forces backed by fighters from the Lebanese Shia Islamist movement Hezbollah, Iranian Revolutionary Guards and members of Abu al-Fadl Abbas, an Iraqi Shia militia, had launched a "fierce offensive to reoccupy" Aleppo. 
  
 Aleppo has been divided roughly in half by the government and opposition since mid-2012, when rebel fighters launched an offensive to gain control of northern Syria. 
  
 However, in the past few weeks the army has secured the area around the city's international airport and retaken the strategically important Base 80 nearby. Troops have also captured the towns of Safira and Tal Aran. 
  
 Despite the rebel losses, Saleh was resolute in an interview with Opposition Orient Television last week, insisting: "We will not let Iran and Hezbollah advance except over our dead bodies." ||||| Key Syria rebel chief killed in regime strike 
  
 (AFP) – Nov 18, 2013 
  
 Beirut — Abdel Qader Saleh, the charismatic chief of the Syrian rebel Liwa al-Tawhid Brigade, has died of his wounds after a regime air strike last week, rebels and activists said Monday. 
  
 His death is a blow to the opposition, particularly in the Aleppo area that Saleh came from and fought in, where the Syrian regime has made a string of advances in recent weeks. 
  
 Saleh was considered one of the opposition's most respected commanders, with ties across the opposition seeking to oust President Bashar al-Assad, and his death was widely mourned on Monday. 
  
 The 33-year-old "was the first to organise peaceful demonstrations in Aleppo and then the first to attack the bastions of Assad's gangs", the opposition National Coalition said in a statement. 
  
 "He became a living symbol in the hearts of the Syrians," the statement added. 
  
 Saleh's death was announced by Liwa al-Tawhid on its official Facebook page and confirmed by the Britain-based Syrian Observatory for Human Rights. 
  
 "Abdel Qader Saleh, known as Hajji Marea, died of wounds he sustained last Thursday when warplanes targeted the Liwa al-Tawhid leadership," the watchdog said in a statement. 
  
 "He was taken to Turkey after being wounded, and died in a hospital there before being brought back to Syria for burial," Observatory director Rami Abdel Rahman told AFP. 
  
 Thursday's strike also killed Liwa al-Tawhid's intelligence chief Yussef al-Abbas, known as Abu al-Tayyeb. 
  
 He had been in a car along with Saleh, and another senior figure in the rebel group, Abdelaziz Salameh, who was also wounded. 
  
 Following the attack, Liwa al-Tawhid arrested 30 people suspected of being regime informers. 
  
 Saleh, chief of operations for Liwa al-Tawhid, was widely seen as the brigade's most important figure. 
  
 A former grain merchant, he was one of tens of thousands of civilians who took up arms as a 2011 peaceful uprising against Assad gradually turned violent. 
  
 He was considered a moderate Islamist, particularly compared to the hardline jihadists who have flooded into Syria, and said he sought an Islamic state but with free elections. 
  
 "In Europe, all the leaders are Christian because the majority is Christian. In Syria, the majority is Muslim and the government should be too, elected by the people," he told AFP during an interview in March. 
  
 Saleh's death comes as the Syrian regime makes new gains in Aleppo, seizing several towns and talking about reopening Aleppo International Airport after nearly a year of closure. 
  
 "As an individual, he was very, very important, certainly in the Aleppo area, but increasingly as an individual that many in Syria felt represented the revolution," said Charles Lister, an analyst at IHS Jane?s Terrorism and Insurgency Centre. 
  
 "He came from a humble background, was outwardly religious but was very open... and he maintained extremely good relations with almost all groups of all different natures." 
  
 Lister said Saleh's death would be "a very significant blow" to the opposition, but added that it could "spur on the rebels to launch a counterattack as the regime advances". 
  
 In a sign of his good ties across the opposition spectrum, Saleh -- a father of five -- was being widely mourned on social media sites by activists and fighters from a range of groups. 
  
 Liwa al-Tawhid, which is backed in part by Qatar, has some 8,000 fighters and is among a number of Islamist units that have rejected the mainstream opposition National Coalition. 
  
 It does participate in the military command linked to the Coalition, and is one of the best known rebel brigades fighting in the Aleppo area, where Saleh was widely known. 
  
 Copyright © 2013 AFP. All rights reserved. More » |||||

The New York Times describes Abdulkader al-Saleh as a Syrian rebel leader "who brought together one of the most effective and organized factions" against Bashar al-Assad. No wonder, then, that his death is being described as a major setback for the rebels. The Syrian Observatory for Human Rights today confirmed that Saleh died from injuries sustained when regime troops attacked a rebel leaders' gathering in Aleppo on Thursday. Saleh led the Tawhid Brigade, a top fighting force backed by Qatar, and one of its commanders says Saleh actually died on Thursday. A lid was reportedly kept on the news until yesterday's burial occurred; others say the death was kept quiet to keep up morale as the government gains ground. "He was very, very important ... increasingly as an individual that many in Syria felt represented the revolution," an analyst tells AFP, saying Saleh's death could "spur on the rebels to launch a counter-attack as the regime advances." A spokesman for the Tawhid Brigade says the group's political leader, Abdul Aziz Salama, has taken full charge of the group, which numbers between 8,000 and 10,000, the BBC reports. But activists tell the Times that former Syrian officer Mohammed Hamadeen will take over.