The General Assembly 1965 Declaration on Non-Intervention by States (Harris, p. 742-3) and
the subsequent 1970 Declaration on Friendly Relations Between States go further than the
Charter and makes clear that every State has the duty to refrain from organising, instigating,
assisting, or participating in acts of civil strife in another state and the duty not to foment, incite, or
tolerate subversive, terrorist, or armed activities directed towards the violent overthrow of the
regime of another State. As such, States have a duty not to intervene in the affairs of another
State, especially if that State is facing an internal struggle: in Nicaragua, the ICJ confirmed the
right of each State to choose its own government, even if non-democratic (the United States had
suggested that the Sandinista rebels who had seized power were non-democratic and Communist,
justifying in part its intervention against them). The Court has, in Nicaragua and Armed
Activities, distinguished between assisting a government of a State (lawful: it would be by
invitation of that State); and to assist an opposition forcibly to overthrow a State (unlawful). Thus,
States would in practice assist rebel movements covertly, not overtly, and as such avoid
accusations of fomenting or inciting the overthrow of the government.