This undated picture released by the Korean Central News Agency on March 11, 2013 shows North Korean leader Kim Jong Un (C) visiting the Wolnae Islet Defence Detachment in North Korea’s western sector. US President Barack Obama said there were signs that China was recalculating his policy towards North Korea out of frustration at Kim’s nuclear brinkmanship.
North Korean leader Kim Jong Un (C) visits the Wolnae Islet Defence Detachment in North Korea's western sector
