The Russian military has moved artillery units manned by Russian personnel inside Ukrainian territory in recent days and is using them to fire at Ukrainian forces, NATO officials said on Friday.
The West has long accused Russia of supporting the separatist forces in eastern Ukraine, but this is the first time it has said it had evidence of the direct involvement of the Russian military.
The Russian move represents a significant escalation of the Kremlin's involvement in the fighting there and comes as a convoy of Russian trucks with humanitarian provisions has crossed into Ukrainian territory without Kiev's permission.
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