The second new crime, which prohibits the use of certain weapons in a non-international armed conflict, was also ratified by Lichtenstein yesterday. San Marino was the first to ratify this crime on 26 September 2011.

BACKGROUND
The crime of aggression
At the Review Conference, which took place from 31 May to 11 June 2010 in Kampala, Uganda, ICC States parties adopted provisions governing the terms of the Court's ability to investigate and prosecute individuals for the crime of aggression (article 8bis). States agreed upon a jurisdictional regime for the crime of aggression, which provides separate procedures depending on whether the situation was referred by the UN Security Council, or whether it came before the ICC through a state referral or upon the ICC prosecutor's initiative. The Review Conference determined that the activation of jurisdiction is still subject to a positive decision by the Assembly of States Parties - the Court’s governing body - which cannot be taken before 1 January 2017 and one year after the ratification or acceptance of the amendments by 30 States parties, whichever is later.
Article 8 of the Rome Statute
The amendment to article 8 of the Rome Statute (or "Belgian proposal") extends the use of certain weapons as war crimes in non-international conflicts, namely the use of poison, poisoned weapons, asphyxiating, poisonous or other gases and all analogous liquids, materials or devices as well as the use of bullets that expand or flatten in the body.