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			 Russia did not immediately respond to the accusation which, if 
			confirmed, would go further to kill off a European-brokered truce 
			that was met by relentless rebel advances after it came into force 
			on Sunday. Moscow has always denied accusations in the past that its 
			forces are fighting in Ukraine. 
			 
			Nevertheless, there were signs that the rebels may be prepared to 
			halt their advance, having achieved their main military objective 
			this week by seizing the strategic town of Debaltseve in defiance of 
			the ceasefire. 
			 
			Reuters journalists in the battle zone, including Debaltseve itself 
			now firmly in rebel hands, said it was quieter than it had been for 
			days. Kiev and the rebels both announced a new agreement, signed by 
			Ukrainian generals and separatist leaders, to begin withdrawing 
			heavy weapons from the front line, one of the main requirements of 
			the truce deal. 
			 
			Kiev's biggest worry is that rebels will continue their advance to 
			threaten Mariupol, a highly strategic port of 500,000 people that is 
			the biggest city still under government control in the two 
			rebellious eastern provinces. Novoazovsk, where Kiev said Russia was 
			reinforcing, lies 40 km (25 miles) to the east along the coast near 
			the Russian border. 
			 
			"In recent days, despite the Minsk (ceasefire) agreement, military 
			equipment and ammunition have been sighted crossing from Russia into 
			Ukraine," military spokesman Andriy Lysenko said. He said more than 
			20 Russian tanks, 10 missile systems and busloads of troops had 
			crossed the frontier. 
			
			  The United States, which is considering tightening sanctions against 
			Russia and arming Kiev, also says it has sighted Russian 
			reinforcements. The State Department said Russian support for the 
			rebels was undermining international diplomacy and would bring 
			"costs" on Moscow. 
			 
			Western nations have held out hope they can revive a peace deal 
			brokered by France and Germany in the Belarussian capital Minsk on 
			Feb. 12, even though the rebels ignored it to seize Debaltseve, a 
			town on a strategic railway hub, inflicting one of the worst defeats 
			of the 10-month-old war on Kiev. 
			 
			"We are more convinced than ever that they must be applied - all the 
			agreements, nothing but the agreements," French President Francois 
			Hollande said in Paris alongside German Chancellor Angela Merkel on 
			Friday. 
			 
			"THESE ARE OURS NOW" 
			 
			In Debaltseve, where Kiev was forced to withdraw thousands of 
			besieged troops this week, the black, blue and red flag of the 
			rebels' self-proclaimed Donetsk People's Republic flew over the town 
			hall. Artillery could be heard in the distance. 
			 
			Walls were pock-marked by bullets or had huge holes blown in them. 
			Burnt-out hulks of tanks and military trucks lay abandoned on the 
			road. Heavily armed rebels and tanks patrolled the streets on the 
			outskirts, where bridges had been blown up and the railway appeared 
			to have suffered major damage. 
			 
			A separatist fighter picked out ammunition left by fleeing 
			government troops from the rubble. 
			 
			"These are ours now, and we'll use them against them. We have to 
			expand," said the rebel who refused to give his name, straightening 
			up while a dozen others continued their search for arms and 
			ammunition. 
			
			  
			
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			The town held around 27,000 people before the fighting. Most fled 
			during the battle, but thousands remained trapped inside, sheltering 
			in cellars during days of relentless bombardment. Several hundred 
			lined up for food in the centre of town. Many were weeping as they 
			stood in the queue. 
			 
			"We're waiting. They should bring dry meals in blue packaging since 
			the pasta is already finishing," said Yulia, 28, a teacher, holding 
			her 10-year-old niece by the hand. 
			
			DARK MOOD AT UPRISING ANNIVERSARY 
			 
			In the capital Kiev, the military setbacks darkened the mood as 
			crowds gathered for the first anniversary of an uprising that 
			toppled the Moscow-leaning president Viktor Yanukovich and 
			culminated in war. 
			 
			Ukraine's President Petro Poroshenko accused a top aide to Russia's 
			Vladimir Putin of being behind the sniper killings of 100 Ukrainian 
			protesters on the streets of Kiev during the uprising a year ago. 
			 
			"Just a few days ago, the head of state security told me that 
			special forces operatives gave evidence that the Russian 
			presidential aide Vladislav Surkov led the organisation of groups of 
			foreign snipers on the Maidan," Poroshenko told some of the 
			relatives of those killed, according to his website. 
			 
			Russia's Foreign Ministry called the accusation "madness". 
			 
			Crowds headed to observe the anniversary at Independence Square in 
			the heart of the capital, known locally as "the Maidan" and revered 
			by Ukrainians as platform of a revolution that turned the country 
			away from Russia and towards Europe. 
			 
			"We have shown the world, we have shown everyone that we can stand 
			against the regime without weapons, that we are free people and we 
			will fight till the end, till victory," said Mykola Tokar who 
			travelled from the Lviv region in the west to attend the ceremonies 
			in Kiev. 
			 
			Some people wore combat fatigues showing allegiance to 
			pro-government militias that have fought alongside Kiev's troops 
			against pro-Russian separatists. The mood was sombre. 
			  
			
			
			  
			
			More than 5,600 people have been killed in fighting since mid-April 
			last year, soon after Russia annexed Crimea from Ukraine following 
			Yanukovich's overthrow. 
			 
			(Additional reporting by Natalya Zinets; Writing by Timothy Heritage 
			and Richard Balmforth; Editing by Peter Graff) 
			
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