Prime Minister Shinzo Abe says the government spent half a year deciding to end the country's main UN peacekeeping mission in South Sudan.Abe was responding to a lawmaker during an Upper House committee session on Monday. The government announced on Friday that it will not send another Ground Self-Defense Force unit to replace the current one.The lawmaker said the current team is the first that has been given the expanded role of coming to the defense of aid workers. The lawmaker asked Abe why the government decided to end the mission and what he thinks of criticism that the government made the decision due to the worsening security situation.Abe replied that the government started discussing the matter in September.He said efforts to stabilize South Sudan are making progress, and nation-building is entering a new phase. He added that the SDF unit will soon finish building roads in the capital city of Juba, so the government has decided to end the mission at the end of May.Abe also said the withdrawal will not go smoothly without the cooperation of the South Sudanese government, and that President Salva Kiir has promised to help the unit leave.The prime minister said Japan will continue sending SDF personnel to the headquarters of the South Sudan mission. He also said Japan will help the African nation make progress in its political process and provide food and other humanitarian assistance. He added that the Japanese government is making final arrangements to provide support worth 6 million dollars for South Sudan.