Professor Michael Walzer of Princeton identified four obligations, in order of descending importance, of any country in the world. A country’s first priority is to protect the life and liberty of its own citizens; if it fails to do that, it cannot put itself into a position to help others. This informs the usual military might exhibited by superpowers, even in the absence of any war.
The second duty is not to inflict any harm of any degree on the people it protects. Its third duty is; when possible, to help people avoid man-made and natural disasters. The fourth duty is to assist those who want aid in building better and less repressive political systems.