It took the International Law Commission approximately four decades to complete its work on State responsibility, which was completed in 2001.
This work represented a highly significant step in the codification and development of international law, with similar importance as the Vienna Convention on the Law of Treaties. These Articles cover the issues of breach of international law and excuses or justifications for it; reparation for injustices, determination of responsibility, and standing of States in the public interest.
While not binding authority, the ILC Draft Articles have been exceedingly well received, and are often cited by the International Court of Justice as well as many arbitral tribunals in investor-State disputes. Please note that certain treaty regimes, including the European Convention on Human Rights, to which all States in Europe except Belarus have acceded, have established their own special rules of responsibility.