Teribus Medieval in the sense that might is right. The rule of law when a knight or Lord of the manor etc had an issue with a peasant was the biggest fist.This probably held sway long after magna carta. Similarly the drone is a big fist where no due legal process is allowed.
The legality of their use is dubious and has not been tested in any international court. Those involved in their use could be a party to murder.


https://www.theguardian.com/politics/2015/sep/09/legal-and-moral-questions-about-drone-strikes-in-syria
https://www.theguardian.com/us-news/2016/nov/15/targeted-killing-secrecy-drone-memos-excerpt
https://www.americanprogress.org/issues/security/reports/2016/04/01/134494/are-u-s-drone-strikes-legal/


http://scholarship.law.georgetown.edu/cgi/viewcontent.cgi?article=2296&context=facpub
https://www.theguardian.com/politics/2016/may/10/uk-drone-strikes-murder-charges-clarify-legal-basis-targeted-kill-