Calls upon the Member States hosting or having hosted United Nations peacekeeping operations to promote accountability for the killing of, and all acts of violence against United Nations personnel serving in peacekeeping operations, including, but not limited to, their detention and abduction, in line with their national law, and consistent with applicable international obligations, including under international humanitarian law, and international human rights law, and encourages Member States hosting or having hosted peacekeeping operation, to address impunity for such acts against United Nations personnel serving in peacekeeping operations, including through strengthening their police, justice and corrections institutions; recognizes, in this regard, the need to enhance support to Member States hosting United Nations peacekeeping operations, as appropriate, for the implementation of effective and efficient investigation and prosecution measures, including through technical and logistical support, to address impunity and ensure accountability for such acts, and encourages the Secretary-General through relevant United Nations entities, as appropriate, on request of the host state, and within existing mandate and capacities, to support and facilitate capacity building and technical assistance to the host state authorities, including relevant law enforcement, prosecutorial, judicial and corrections institutions, the collection and preservation of evidence, victim and witness protection, forensics, and safety and security arrangements for courts and detention facilities, as appropriate;