A senior Russian security official has accused NATO of ratcheting up tensions over Ukraine, by boosting its military presence along Europe's eastern borders. Mikhail Popov said Russia would have to adapt its defence strategy accordingly. On the ground things are getting more intense. The Ukrainian military said 15 of its personnel had been killed the past 24 hours. Its forces retreated from Luhansk airport - they say Russian units were involved in the fighting. Moscow denies sending soldiers into Ukraine. Our World Affairs Correspondent Nick Childs has this report.
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