In this Saturday, Dec. 8, 2012 photo, Chinese paramilitary policemen build a fence near a crossing into North Korea at the Chinese border town of Tumen in eastern China's Jilin province. Over the past year, Kim Jong Un has intensified a border crackdown that has attempted to seal the once-porous 1,420-kilometer (880-mile) frontier with China, smugglers and analysts say, trying to hold back the onslaught.(AP Photo/Ng Han Guan)

Associated Press
In this Saturday, Dec. 8, 2012 photo, Chinese paramilitary policemen build a fence near a crossing into North Korea at the Chinese border town of Tumen in eastern China's Jilin province. Over the past year, Kim Jong Un has intensified a border crackdown that has attempted to seal the once-porous 1,420-kilometer (880-mile) frontier with China, smugglers and analysts say, trying to hold back the onslaught.(AP Photo/Ng Han Guan)
In this Saturday, Dec. 8, 2012 photo, Chinese paramilitary policemen build a fence near a crossing into North Korea at the Chinese border town of Tumen in eastern China's Jilin province. Over the past year, Kim Jong Un has intensified a border crackdown that has attempted to seal the once-porous 1,420-kilometer (880-mile) frontier with China, smugglers and analysts say, trying to hold back the onslaught.(AP Photo/Ng Han Guan)
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