BEIRUT/GENEVA (Reuters) - Syria's army and allies closed in on areas near Aleppo's Old City on Tuesday, looking closer than ever to achieving their most important victory of the five year civil war by driving rebels out of their last urban stronghold.Rebels said on Tuesday they would never abandon Aleppo, after reports that U.S. and Russian diplomats were preparing to meet to discuss the surrender and evacuation of insurgents from territory they have held for years.Russia said its Syrian government allies had taken control of five more districts of Aleppo, and had now seized 35 districts from the rebels during an advance that has changed the course of the conflict.The government now appears closer to victory than at any point since 2012, the year after rebels took up arms to overthrow President Bashar al-Assad in a war that has killed hundreds of thousands of people, made more than half of Syrians homeless and created the world's worst refugee crisis.The Syrian Foreign Ministry said it would accept no truce at this point in Aleppo, should any outside parties try to negotiate one. Russia and China vetoed a U.N. Security Council resolution on Monday calling for a weeklong ceasefire. Moscow said rebels used such pauses in the past to reinforce.Rebel-held districts of Aleppo, reduced to a few kilometers across, where tens of thousands of civilians are trapped, looks set to fall. The United Nations, whose staff are restricted to government-controlled areas of the city, on Tuesday described "a very disastrous situation in eastern Aleppo"."There has been heavy shelling on us, there are massacres (of civilians), there's no electricity and little internet access," said Abu Youssef, a resident of one of the areas still held by the fighters.Damascus and Moscow have been calling on rebels to withdraw from the city, disarm and accept safe passage out, a procedure that has been carried out in other areas where rebels abandoned besieged territory in recent months.Russian Foreign Minister Sergei Lavrov said talks with the United States on the withdrawal of rebels from Aleppo would begin in Geneva on Tuesday evening or Wednesday morning.A U.S. official told Reuters Washington would embrace the talks as a step to save lives.But rebels have told U.S. officials they will not withdraw, and said there had been no more formal contact with Washington on the topic since then."The Americans asked if we wanted to leave or to stay ... we said this is our city, and we will defend it," Zakaria Malahifji, a Turkey-based official for the Fastaqim rebel group, told Reuters on Tuesday.The Cold War-era superpowers have backed opposing sides in the war, but Russia has intervened far more openly and decisively, joining Iran as well as Iraqi and Lebanese Shi'ite groups to back Assad.Some of the groups fighting in eastern Aleppo have received support in a U.S.-backed military aid program to rebels deemed moderate by the West. However, this has been minimal compared to massive Russian air support to aid Assad's government, which has turned the tide of the war in his favor over the past year.The army said it had taken over areas to the east of the Old City including al-Shaar, Marja and Karm al-Qaterji, bringing them closer to cutting off another pocket of rebel control.The British-based Syrian Observatory for Human Rights said al-Shaar and some other areas had been taken, but did not immediately confirm the takeover of all the areas announced by the army. A Turkey-based rebel official denied al-Shaar had been taken but said fighting continued in the neighborhood.'We will defend it'The rebels' loss of the eastern half of Aleppo, Syria's largest city before the war, would be the biggest victory of the conflict so far for Assad, securing his grip on all Syria's main cities.It would also be a success for President Vladimir Putin who intervened to save Moscow's ally in September 2015 with air strikes, and for Shi'ite Iran, whose elite Islamic Republic Guard Corps has suffered casualties fighting for Assad.U.N. official Jens Laerke said: "Winter is approaching, it's already getting very, very cold so that has come up as a priority need ... Food is running out, the little food that is available is being sold at extremely inflated prices."While rebels have said they will not leave, one opposition official, who declined to be identified, conceded they may have no alternative for the sake of civilians who have been under siege for five months and faced relentless government assaults.Insurgents, meanwhile, have fought back ferociously inside Aleppo. Some of the fighting took place within a kilometer of the ancient citadel, a large fortress built on a mound, and around the historic Old City.With narrow alleyways, big mansions and covered markets, the ancient city of Aleppo became a UNESCO heritage site in 1986. Many historic buildings have been destroyed in the fighting.'Useful Syria' and 'Daeshistan'Apart from their support for rebels fighting against Assad, Western countries are also taking part in a U.S.-led air campaign against Islamic State, the Sunni Muslim militant group which broke away from other anti-Assad groups to proclaim a caliphate in territory in Syria and neighboring Iraq.Moscow says helping Assad is the best way to defeat Islamic State. Western countries say the group gains strength from the fury unleashed by Assad's military crackdown on his enemies.France said on Tuesday that Russia's strategy of helping Assad to divide the country would cement a radicalized Islamist threat within Syria and create lasting regional chaos."There is a logic of total war with incredible brutality of the Assad regime that aims at conquering useful Syria. It's a dramatic situation that will only get worse," French Foreign Minister Jean-Marc Ayrault told RFI radio.France, a staunch backer of the anti-Assad opposition, will convene foreign ministers of like-minded countries in Paris on Saturday to try to come up with some form of strategy in the wake of the Aleppo onslaught, although few diplomats expect anything concrete to be achieved."With this total war, it is the partition of Syria that is taking place with the risk that a 'Daeshistan' is created next to this useful Syria," Ayrault, said. Daesh is an Arabic acronym for Islamic State.Western countries say that even if government forces take Aleppo, they will still not be able to end the conflict, as long as millions of Syrians see the government as a brutal enemy."Aleppo falls, but the war goes on," said one U.S. official.He and other current and ex-U.S. officials argued that rebels who escape Aleppo would keep fighting, with some likely joining groups such as Jabhat Fateh al-Sham, formerly known as the Nusra Front, which Washington regards as al Qaeda's Syrian branch.Other U.S. officials warned the conflict could escalate as flagging U.S. support for Assad's opponents could prompt Saudi Arabia, Qatar and Turkey to intensify their military aid to rebel groups.Join the conversation about this storyNOW WATCH: Watch the trailer for the new Martin Scorsese film that took over 20 years to make
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