During the prohibition era, the sale and consumption of alcohol was banned in the United States.

In APA style, you can cite the United Nations Convention on the Rights of the Child as follows: United Nations. (Year). Convention on the Rights of the Child. Retrieved from URL. Remember to include the year the convention was adopted and the specific URL where it can be accessed.

United Nations Convention on the law of the sea :)

If the nation which is using the banned weapons has signed the Convention, then yes its against the commitment that nation made when it signed the Convention for that nation to use banned weapons, even against a foe who has not.