Russian troops are stepping up work on a controversial new barrier dividing Georgia from the disputed region of South Ossetia. The area saw a brief conflict between Russia and Georgia in 2008. Georgia lost a fifth of its territory when the republics of South Ossetia and Abkhazia broke away. It's feared the new demarcation line could increase tensions in an area still recovering from conflict. Al Jazeera's Neave Barker reports from the border between Georgia and South Ossetia.