Kiev (CNN) -- Pro-Russian protesters who disarm and leave occupied buildings will not be prosecuted, Ukraine's acting President Oleksandr Turchynov said Thursday. "In the case when people put down their weapons and free administrative buildings, we don't need to approve laws about amnesty. We guarantee there will be no criminal prosecutions of people who put down their weapons and leave the buildings. And I am prepared to formalize it with a presidential decree," Turchynov told parliament. He added that "the main problem is that the people who are holding the buildings in Donetsk and Luhansk are being used by the enemies of Ukraine."
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NEW: Putin writes to European leaders warning that Russia could cut off gas to Ukraine
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Ukraine's leader says protesters won't be prosecuted if they disarm, leave seized buildings
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NATO chief says Russian troops near Ukraine's border are "not training, but ready for combat"
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NATO releases satellite images purportedly showing Russian military hardware
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A series of satellite images released Thursday by NATO appear to show large amounts of Russian military hardware, including armored vehicles, helicopters and surveillance aircraft, massed at different places near the @placeholder border.
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"Russia is trying to justify its actions by accusing the Ukrainian authorities of oppressing @placeholder speakers.
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Designed to subvert the @placeholder government, pervert the truth and divert attention from Russia's own illegal and illegitimate actions."
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"I made final decisions only after the mood of the people became clear, because we had not been preparing for such developments," @placeholder is quoted as telling Russian social activists.
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The action comes as the office investigates the alleged laundering of money "obtained as the result of corruption, theft and appropriation of budget resources and property by the @placeholder ex-President and his family, as well as members of the previous government and people connected with it," it said.
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There is no justification for this, and of course @placeholder cannot accept that price, which is almost $500 for 1,000 cubic meters," he said.