Turkey is stepping up a border security barrier with Iran, primarily to thwart a possible large influx of refugees from entering Afghanistan. Yet for many refugees, the wall, trenches and barbed wire are just more obstacles they say they have no choice but to overcome. VOA’s Heather Murdock has this report from Van, Tatvan and the Turkish border with Iran.Camera: Yan Boechat. Contributing: Mohammad Mahdi Sultani.