Over the world, many people oppose that governments carry out murders by death squads, drones and other means. One way to challenge this is by legal action, which is now done in the UK:
First UK legal challenge to CIA drones
Afghans launch legal action over British drone strike

More countries may be complicit in this, than it first appears. For example, it is believed that satellite data downloaded in Norway and/or Sweden is used in warfare. The Norwegian author Bård Wormdal claims that the SvalSat ground station on Svalbard is involved in this and thus violating the Svalbard Treaty.