State A is a signatory to the 'Rome Statute'. State A intends to host a diplomatic conference on sub-regional development. The International Criminal Court has issued an arrest warrant for one of the Heads of State who will likely be in attendance. You are approached by State A to advise whether it, as a signatory, has an obligation to arrest a Head of State in terms of the Statute. The State has also asked you to differentiate between its obligations, if any, as a signatory and a ratifying State to the Statute. Your advice must refer to authoritative sources of international law.