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NATO on Friday said a Russian military column ventured overnight into Ukraine, and the Ukrainian president said his forces destroyed most of it. Russia denied all of this, but the reports spooked global markets and overshadowed optimism driven by agreement over a Russian aid convoy bound for eastern Ukraine.

The White House said it was looking into what it called unconfirmed reports that Ukraine’s security forces disabled vehicles in a Russian military convoy inside Ukraine.

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The Russian aid convoy of more than 250 trucks has been a source of tensions since it set off from Moscow on Tuesday. Kyiv and the West were suspicious that the mission could be a pretext for a Russian military incursion into eastern Ukraine, where government forces are battling pro-Russia separatists and clawing back rebel-held territory.

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Throughout the eastern crisis that erupted in April, there have been consistent allegations that Russia is fomenting or directing the rebellion. Moscow rejects the allegations and the high-profile aid convoy could be aimed, in part, at portraying Russia as interested in cooling the conflict. Russian President Vladimir Putin appeared to cultivate that perception in a Thursday speech in which he said Russia hopes for peace in Ukraine.