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By Mark Trevelyan and Aleksandar Vasovic MOSCOW/MARIUPOL Ukraine (Reuters) - Ukraine and Russia swapped soldiers who had entered each other's territory near the battlefield in eastern Ukraine, where Kiev says Moscow's forces have come to the aid of pro-Russian insurgents advancing for an assault on a major port. Ukrainian troops and local residents were reinforcing the port of Mariupol on Sunday, the next big city in the path of pro-Russian fighters who pushed back government forces along the Azov Sea this past week in an offensive on a new front. The new rebel advance has drawn increasing concern from Ukraine's Western allies, who say its success is a result of reinforcement by armoured columns of Russian troops. European Union leaders agreed on Saturday to draw up new economic sanctions against Moscow, a move hailed by the United States, which is planning tighter sanctions of its own and wants to act jointly with Europe.
Iraqi forces Sunday broke through to the jihadist-besieged town of Amerli, where thousands of people have been trapped for more than two months with dwindling food and water, officials said. "Our forces entered Amerli and broke the siege," security spokesman Lieutenant General Qassem Atta told AFP. Talib al-Bayati, an official responsible for a nearby area, also said that the siege of the Turkmen Shiite-majority town has been broken, as did Nihad al-Bayati, who had been fighting to defend the town against the jihadists. Iraqi security forces, Shiite militiamen and Kurdish peshmerga fighters all took part in the operation, the biggest military success for Baghdad since a lightning jihadist-led offensive overran large parts of the country in June, sweeping security forces aside.