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As analysts continue to speculate on Russia's intentions regarding Ukraine, one scenario that Kyiv's defence experts find most plausible is an escalation in fighting in the Donbass region. Russian-backed separatists there claim the whole of Luhansk and Donetsk regions as their own. But in reality they control only part of them, having been pushed back by a Ukrainian army offensive in 2014. Our correspondent Gulliver Cragg travelled to Shchastya, a frontline town in the Ukrainian-held part of Luhansk region, where Ukrainian troops guard the strategically important Luhansk power station.