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			 The advances are significant victories for the pro-European 
			leadership in a military operation to crush the rebellion, which 
			began in east Ukraine in April, and hold the country together. 
			Parallel peace moves are moving slowly, however, and Russia is 
			threatening to cut gas supplies to Ukraine from Monday in a row over 
			prices. 
 In central Mariupol, police cordoned off several streets, where 
			roadblocks of sandbags and concrete blocks, once manned by rebels, 
			were riddled with bullet holes, and the burnt-out hulk of an 
			armoured personnel carrier with rebel insignia smouldered.
 
 "At 10:34 a.m. (0734 GMT), the Ukrainian flag was raised over City 
			Hall in Mariupol," Interior Minister Arsen Avakov wrote on Facebook. 
			That was less than six hours after the attack began on the city of 
			500,000, Ukraine's biggest port on the Azov Sea.
 
 A ministry aide said government forces had attacked after 
			surrounding the rebels and giving them 10 minutes to surrender. At 
			least five separatists and two servicemen were killed before many of 
			the rebels fled.
 
 A group of about 100 Mariupol residents, who had gathered in the 
			centre to show their opposition to the government's actions, 
			exchanged obscenities and crude gestures with Ukrainian soldiers 
			driving through town in a column of armoured trucks.
 
			
			 "The government brought everything here, including a cannon ... 
			people were not allowed to come and witness how the government was 
			shooting its own citizens," 52-year-old Andrei Nikodimovich said.
 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 full control of the 2,000-km (1,200-mile) 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 
			border.
 
 Avakov said government forces had won back control of a 120-km 
			(75-mile) stretch of border that had fallen to the rebels, but it 
			was unclear who controlled other parts of the frontier.
 
 In Washington, the U.S. State Department said Russia had sent tanks, 
			heavy weapons and rocket launchers to Ukraine in recent days in 
			support of separatists in the east of the country. The confirmation 
			by the United States of reports that Russian tanks had crossed the 
			border into Ukraine is likely to deepen strains with Moscow.
 
 "We assess that separatists in eastern Ukraine have acquired heavy 
			weapons and military equipment from Russia, including Russian tanks 
			and multiple rocket launchers," State Department spokeswoman Marie 
			Harf said in a statement.
 
 Harf told a briefing earlier that a convoy of three T-64 tanks, 
			several MB-21 "or Grad" multiple rocket launchers and other military 
			vehicles had crossed from Russia into Ukraine in the last three 
			days.
 
 "This is unacceptable," she said. "A failure by Russia to 
			de-escalate the situation will lead to additional costs."
 
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			IMPASSE AT GAS TALKS
 The rebels rose up in the Russian-speaking east and southeast after 
			Russia annexed Crimea in March following the overthrow of 
			pro-Russian 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.
 
 On Friday, one separatist leader, Denis Pushilin, said he could be 
			open to the idea of talks provided there were mediators, including 
			Russia, present. "If an international organisation were also 
			involved, that would be a plus too," he said in an interview on 
			Russian television.
 
 Poroshenko's aides say progress has been made at initial meetings 
			with a Russian envoy and that any immediate threat of a Russian 
			invasion has receded. But tensions have risen at talks on how much 
			Ukraine should pay for Russian natural gas.
 
 Ukraine said it was preparing for gas supply cuts on Monday, the 
			deadline for it to settle $1.95 billion in unpaid bills. This could 
			disrupt supplies to the European Union, as about half of its sizable 
			gas imports from Russia flow via Ukraine.
 
 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 
			Russian 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.
 
 (Additional reporting by Pavel Polityuk and Natalia Zinets in Kiev, 
			Vladimir Soldatkin in Moscow and Lesley Wroughton in Washington; 
			Writing by Timothy Heritage and Alessandra Prentice; Editing by 
			Kevin Liffey and Dan Grebler)
 
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