I've written here previously on the possible activation of the International Criminal Court's jurisdiction over the crime of aggression. Twenty-eight of the requisite thirty countries have now ratified the amendments agreed to at the 2010 Kampala conference. It appears likely that the additional ratifications will arrive in a matter of months (Iceland, the Netherlands, Chile, and Senegal are among the countries that may push the amendment over the finish line).
Latest in aggression
Former Legal Adviser Harold Koh and Todd Buchwald (Assistant Legal Adviser for UN Affairs) have an excellent article in the recently published April 2015 issue of the American Journal of International Law about the many uncertainties created by amendments to the Rome Statute of the International Criminal Court relating to the crime of aggression that were adopted at the 2010 Kampala Review Conference and that may enter into force after 1 January 2017.
Apart from Iraq, no member State of the United Nations has done anything quite like it. First, in 2008 against Georgia, then on an ever widening stage since February 2014 against Ukraine, the Russian Federation has invaded a fellow member State and forcibly separated territory belonging to that country. No other state, not even Russia before the invasions, had made any claim to that territory.