The International Criminal Court (ICC or ICCt) is a permanent international tribunal to prosecute individuals for genocide, crimes against humanity, war crimes, and the crime of aggression

"crime of aggression" (qualify as an act of aggression):
(a) The invasion or attack by the armed forces of a State of the territory of another State, or any military occupation, however temporary, resulting from such invasion or attack, or any annexation by the use of force of the territory of another State or part thereof; 
(b) Bombardment by the armed forces of a State against the territory of another State 
or the use of any weapons by a State against the territory of another State; 
(c) The blockade of the ports or coasts of a State by the armed forces of another State; 
(d) An attack by the armed forces of a State on the land, sea or air forces, or marine and air fleets of another State; 
(more to come)