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			 The advances are significant victories for the pro-European 
			leadership in a military operation to crush the armed separatist 
			rebellion that began in east Ukraine in April and hold the former 
			Soviet republic of 45 million together. 
 "At 10:34 a.m. (0734 GMT) the Ukrainian flag was raised over City 
			Hall in Mariupol," Interior Minister Arsen Avakov wrote on Facebook, 
			less than six hours after the attack began on the city of 500,000, 
			Ukraine's biggest Azov Sea port.
 
 A ministry aide said the government forces stormed the rebels after 
			they were surrounded and given 10 minutes to surrender. At least 
			five separatists and two servicemen were killed in the battle before 
			many of the rebels fled.
 
 Mariupol, which has changed hands several times in weeks of 
			conflict, is strategically important because it lies on major roads 
			from the southeastern border with Russia into the rest of Ukraine 
			and steel is exported through the port.
 
 Regaining control of the long and winding frontier is also vital for 
			the government because it accuses Moscow of allowing the rebels to 
			bring tanks, other armoured vehicles and guns across the porous 
			border.
 
			
			 Avakov said the government forces had won back control of a 120-km 
			(75-mile) stretch of the border that had fallen to the rebels, but 
			it is not clear who controls other parts of the about 2,000-km 
			frontier.
 The rebels, who have taken over several towns and cities and want 
			east Ukraine to become part of Russia, confirmed five of their 
			fighters were killed in the fighting for Mariupol.
 
 Avakov said National Guard and Interior Ministry units were involved 
			in the battle, as well as special forces.
 
 A Ukrainian defence analyst, Dmytro Tymchuk, said four Ukrainian 
			soldiers had been killed and 31 wounded in fighting in other parts 
			of east Ukraine in the past 24 hours. The death toll is not known 
			but several hundred people have been reported killed in clashes this 
			year in Kiev and the east of the country.
 
 GAS TALKS TO RESUME
 
 The rebels rose up in the Russian-speaking east and southeast after 
			Russia annexed Crimea in March following the overthrow of 
			Moscow-leaning President Viktor Yanukovich, who had triggered 
			protests by spurning trade and political pacts that would have 
			deepened ties with the European Union.
 
 The new president, Petro Poroshenko, intensified the military 
			operation against the rebels after he was elected on May 25 but is 
			also trying to win support for a peace plan.
 
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			Rebel leaders have not responded to his suggestion they could be 
			invited to talks if they lay down their arms, and rebels in the 
			field have scoffed at the idea of giving up their weapons, saying 
			they do not trust him. Poroshenko's aides say progress has been 
			made at initial meetings with a Russian envoy, and any immediate 
			threat of a Russian invasion has receded, but talks on solving a 
			natural gas pricing row with Russia have stalled.
 European Energy Commissioner Guenther Oettinger, who is brokering 
			the gas talks, said he hoped they would resume on Saturday.
 
 The sides disagree over how much Ukraine should pay for its gas, and 
			Russian state gas exporter Gazprom has threatened to turn off the 
			taps to Kiev if it does not start paying billions of dollars in 
			debts by Monday. This could disrupt supplies to the EU as it gets 
			about half its gas imports from Russia, half of them via Ukraine.
 
 But Oettinger said in Brussels: "I am optimistic the three parties 
			will do all to avoid a disruption."
 
 Political ties have also been strained by the appearance of several 
			tanks in east Ukraine. Avakov accused Russia on Thursday of allowing 
			the rebels to bring them across the border and Poroshenko told 
			President Vladimir Putin by phone that the situation was 
			"unacceptable."
 
 Evidence that Russia is directly assisting the rebels militarily 
			would implicate Moscow in the uprising, making a mockery of its 
			denials of a role in the fighting. Russia did not immediately 
			respond to the accusations and it was not clear how Putin reacted to 
			Poroshenko by phone. His country has already been hit by U.S. and EU 
			sanctions over events in Ukraine and could face more.
 
 
			 
			(Additional reporting by Natalia Zinets and by Barbara Lewis in 
			Brussels, Writing by Timothy Heritage; editing by Janet McBride)
 
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