Mugume Davis Rwakaringi JUBA ? The South Sudan government has sent a letter to a regional body mediating peace talks in Addis Ababa, asking that seven former political detainees who are suspected of plotting to oust the government be barred from the talks. quot;You cannot include in the negotiations people who are needed by the court. This is something illegal,quot; said Mawien Makol Arik, a spokesman for South Sudan#39;s foreign affairs ministry....