Pakistani Foreign Ministry on Thursday lamented the killing of its UN peacekeeper, who was killed while performing his duties in the strife-torn eastern Democratic Republic of the Congo (DRC). The incident occurred when a military convoy of the United Nations Organization Stabilization Mission in the DRC was ambushed by unidentified assailants in South Kivu, the Foreign Ministry said in Islamabad. \"Pakistan condemns such acts of aggression against the UN peacekeepers and calls on the United Nations to investigate the attack and also strengthen the existing measures in place for the safety of the UN peacekeepers, who are performing the difficult yet commendable task of maintaining peace in troubled regions of the world,\" a statement said. Pakistan, as one of the leading UN Troop Contributing Countries in the world, is contributing significantly to the cause of global peace and security, it added. The statement said Pakistan is saddened to hear the news and sympathizes with the family of the peacekeeper, who laid down his life safeguarding global peace and security.