Effective justice is a shared responsibility
Without the essential cooperation of states, international justice simply cannot function. Without cooperation, ICC investigations and prosecutions can be severely delayed or rendered impossible. As the ICC does not have its own police force, national law enforcement authorities, sometimes with the support of international organizations, must arrest and surrender ICC suspects to The Hague.
Since victims and witnesses often remain in their original countries of residence, national authorities are also responsible for providing them with appropriate protections. For the ICC to engage with victims and witnesses as well as to collect evidence, national authorities must facilitate ICC and ASP personnel's access to their respective territories.
ICC member states should also enter into voluntarily host persons convicted by the Court to serve out their sentences, to host acquitted persons or temporarily released defendants in ongoing cases when these persons cannot return to their own countries.
But for all this to happen, politician must create conditions conducive to good cooperation in their words and actions.