A/HRC/34/44 perpetrate crimes against children in situations of conflict. The Human Rights Council is also urged to include a focus on the fight against impunity for grave violations when it mandates commissions of inquiry or holds special sessions. 63. The Special Representative welcomes the recent ratifications of the Optional Protocol to the Convention on the Rights of the Child on the involvement of children in armed conflict and continues her call to States that have not yet done so to sign and ratify the treaty, to enact legislation to explicitly prohibit and criminalize the recruitment and use of children by armed forces or groups and the use of children in hostilities, and to establish the minimum age for recruitment into the armed forces at 18 years, when depositing their binding declaration upon ratification of the Optional Protocol. 18