Prisoner of war
In the past, when a country broke the Geneva Convention by not giving prisoners of war their rights, many different things might happen.  For example, after World War II ended, the countries that won the war set up military tribunals called the Nuremberg Trials and the Tokyo Trials.  At these trials, military leaders from Nazi Germany and the Empire of Japan were tried for crimes against prisoners of war (and many other things).  Many of them were convicted and sentenced to death or to life in prison.