Around the Georgian village of Khurvaleti, Russia's occupation can creep forward a few yards at a time, often in the middle of the night.It often starts with a line ploughed across a field.Then a green sign will materialise, warning people not to cross.Then the concertina wire appears.Khurvaleti is at the southern edge of South Ossetia, a breakaway region occupied by Russian troops since a five-day war with Georgia in 2008, in what proved to be a dress rehearsal for Ukraine.
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