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			 Ukraine's military said its warplanes had inflicted heavy losses 
			on the pro-Russian separatists during air strikes on their 
			positions, including an armoured convoy which Kiev said had crossed 
			the border from Russia. 
 Ukrainian President Petro Poroshenko's office said Kiev would 
			present documentary proof of incursions from Russia to the 
			international community via diplomats on Monday.
 
 But Russia kept up pressure on Kiev over the death of a Russian man 
			who, it said, was killed by a Ukrainian shell that hit a residential 
			area of a Russian border town.
 
 The Ukrainians have denied the shell was theirs. But a Russian 
			newspaper, citing a source close to the Kremlin, said on Monday that 
			Moscow was considering the possibility of pinpoint strikes on 
			Ukraine in retaliation.
 
			
			 
 The intensified military activity and Moscow's threat of 
			"irreversible consequences" after the cross-border shelling marks a 
			sharp escalation in the three-month conflict between Ukrainian 
			forces representing Kiev's pro-Western leadership and separatists 
			who have set up 'people's republics' in the east and said they want 
			to join Russia.
 
 Ukrainian forces, taking the lead from Poroshenko who swore to "find 
			and destroy" the separatists who killed 23 servicemen in rocket 
			strikes on Friday, went on the offensive across a broad range of 
			targets south and south-east of the border town of Luhansk and near 
			the town itself.
 
 Poroshenko's office on Monday said Ukrainian forces, backed by 
			warplanes, had broken through rebel lines surrounding Luhansk 
			airport, ending a separatist blockade.
 
 A spokesman for the so-called Luhansk People's Republic said on 
			Monday that 30 volunteer fighters had been killed in Ukrainian fire 
			on Oleksandrivka, a village to the east of the town, Russia's 
			Interfax news agency said.
 
 PUSHING FOR SANCTIONS
 
 Poroshenko on Sunday complained of alleged Russian incursions into 
			Ukraine in a telephone call with the European Union's Herman Van 
			Rompuy with an eye to pushing the 28-member bloc to take further 
			sanctions against Moscow.
 
 The EU - Ukraine's strategic partner with which it signed a landmark 
			political and trade agreement last month - targeted a group of 
			separatist leaders with travel bans and asset freezes on Saturday 
			but avoided fresh sanctions on Russian business.
 
			 But a Ukrainian presidential aide said Kiev-based diplomats would be 
			called in on Monday and informed of facts documenting the passage 
			across the border from Russia of military equipment "used in attacks 
			on our serving forces".
 "We have the facts and the testimony which we will show to the 
			international community," the aide, Valery Chaly, said, according to 
			Poroshenko's website.
 
 In Moscow, the newspaper Kommersant quoted a source close to the 
			Kremlin as saying pinpoint strikes might be carried out in 
			retaliation for the killing of the Russian man in a border town 
			which bears the same name as Ukraine's main eastern city of Donetsk.
 
 The source said Russia "knew exactly where fire was coming from." He 
			said it would not be a massive action but pinpoint strikes on the 
			positions where the shelling came from.
 
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			Russia sent Ukraine a diplomatic note of protest describing the 
			incident as "an aggressive act" against Russia and its citizens and 
			warning of "irreversible consequences". Andriy Lysenko, spokesman 
			for Ukraine's National Security and Defence Council, denied that 
			Ukrainian forces had fired onto Russian territory and on residential 
			areas. The Ukrainian foreign ministry called on Russian authorities 
			to carry out "an objective and impartial" evaluation of what it 
			described as "a tragic incident".
 Moscow's response to the cross-border shelling raises again the 
			prospect of Russian intervention, after weeks in which President 
			Vladimir Putin had appeared intent on disengaging, pulling back tens 
			of thousands of troops he had massed at the frontier.
 
 The conflict in eastern Ukraine erupted in April when armed 
			pro-Russian fighters seized towns and government buildings, weeks 
			after Russia annexed Ukraine's Crimea peninsula in response to the 
			overthrow of a pro-Moscow president in Kiev.
 
 Well over 200 Ukrainian servicemen had been killed in the fighting 
			and several hundred civilians and rebels.
 
 The fighting has escalated sharply in recent days after Ukrainian 
			forces pushed the rebels out of their most heavily fortified 
			bastion, the town of Slaviansk.
 
			
			 
 Hundreds of rebels, led by a self-proclaimed defence minister from 
			Moscow, have retreated to the Ukrainian city of Donetsk, built 
			reinforcements and pledged to make a stand. The once-bustling city 
			has been emptying in fear of a battle.
 
 Rebel fighters on Monday were evacuating about 200 Donetsk residents 
			by bus across the Russian border into the Rostov area.
 
 Vladimir, a 55-year-old coal miner, was sending his wife with two 
			children to relatives across the border. "The Ukrainians have 
			already cut off water. Electricity is only just working. How can you 
			live without water and light? I have no work but if on top of that I 
			have nowhere to live either there is no reason to be here," he said.
 
 (Additional reporting by Natalya Zinets in Kiev; Writing by Richard 
			Balmforth; Editing by Giles Elgood)
 
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