@mcnado Perhaps this European Convention on Human Rights, a 1950 document, is enlightening: https://www.echr.coe.int/documents/d/echr/convention_eng (see Protocol 6: "The death penalty shall be abolished. No one shall be condemned to such penalty or executed.")

See also smaller writeup on abolition of death penalty in Europe: https://www.coe.int/en/web/abolition-death-penalty/abolition-of-death-penalty-in-europe