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Rebels shoot down Ukraine troop helicopter

General among dozen killed in missile attack

Pro-Russia fighters of the Vostok battalion ripped apart a Ukrainian flag outside a regional state building in the eastern city of Donetsk on Thursday.

Viktor Drachev/AFP/Getty Images

Pro-Russia fighters of the Vostok battalion ripped apart a Ukrainian flag outside a regional state building in the eastern city of Donetsk on Thursday.

SLOVYANSK, Ukraine — In another devastating blow to Ukraine’s armed forces, rebels shot down a troop helicopter Thursday, killing at least 12 soldiers, including a general who had served in the Soviet army and was in charge of combat training.

The loss underscored the challenge Ukrainian forces face in fighting a guerrilla-style insurgency that has proven to be an agile foe.

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Ukraine, meanwhile, said that president-elect Petro Poroshenko will be sworn in June 7, fewer than two weeks after his overwhelming victory in special balloting that was hoped would ease tensions in the deeply divided country. Poroshenko has promised to negotiate with representatives in rebellious eastern Ukraine but also has vowed to uproot the pro-Moscow rebels who want the region to join Russia.

The Mi-8 helicopter was downed on the outskirts of Slovyansk by rebels using a portable air defense missile, according to Oleksandr Turchynov, Ukraine’s acting president, in remarks to Parliament in Kiev. Slovyansk, a city of 120,000 people, has become a focal point for the insurgency and has for weeks been encircled by Ukrainian troops.

Turchynov said the helicopter was rotating troops into a checkpoint when it came under fire. Among the dead was General Serhiy Kulchytskiy, who the Interfax news agency said was in charge of training Ukraine’s National Guard.

White House spokesman Jay Carney said the United States is concerned because it indicates the separatists still have access to advanced weapons and are getting help from outside Ukraine, alluding to Russia.

Ukrainian forces are better equipped that their opponents, but some fear the fighting could degenerate into brutal urban warfare. That has held authorities back from ordering an all-out assault.

‘‘It is extremely difficult to fight against guerrillas. You just cannot destroy them. They are not regular troops,’’ said Igor Sutyagin, a research fellow at the London-based Royal United Services Institute. ‘‘It’s the classic problem which Russia had in Chechnya and the United States had in Vietnam.’’

The Ukrainian government has been waging a military campaign in the Donetsk and Luhansk regions to try to put down the uprising by gunmen who have taken over public buildings and set up checkpoints. Dozens have been killed on both sides, including on Monday, when Ukrainian forces used fighter jets and helicopter gunships to dislodge rebels from the airport outside the city of Donetsk, the regional capital.

In recent days, Ukrainian troops have been using mortars to try to retake Slovyansk, causing civilian casualties and prompting some residents to flee. The tactic has produced few immediate results other than deepening distrust toward the government in the city and instilling general fear.

‘‘They are shooting at us from grenade launchers. We hear explosions. The windows of our house are shaking,’’ said Olga Mikhailova, who said she was leaving Slovyansk for the safety of her family.

Russia’s Foreign Ministry denounced the use of aircraft and artillery against the rebels and demanded that Kiev end a ‘‘fratricidal war and launch a real political dialogue with all political forces and representatives of the regions.’’

It would be impossible to restore peace without Kiev halting the military operation against the rebels and withdrawing its troops, the ministry said. It urged the West to use its influence with Kiev to ‘‘stop Ukraine from sliding into a national catastrophe.’’

In an apparent bid to de-escalate tensions and avoid a new round of Western sanctions imposed after Moscow annexed the Crimean Peninsula in southern Ukraine, Russian President Vladimir Putin has ignored the appeal by the separatists to join with Russia. His spokesman, Dmitry Peskov, said Moscow has agreed to send ‘‘humanitarian aid’’ to eastern Ukraine.

Also, US defense officials said Russia had pulled most of its forces from the Ukraine border, with a couple of thousand troops remaining out of an original 40,000. The United States had been demanding the withdrawal. The defense officials spoke only on condition of anonymity because they were not authorized to speak publicly about the numbers.

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