The Geneva Conventions Don't Apply To Unlawful Combatants.

https://news.sky.com/story/ukraine-war-foreign-secretary-raises-issue-of-britons-facing-death-penalty-in-donetsk-with-ukrainian-counterpart-12631339

Their choice to use civilians as human shields makes them unlawful combatants. As the tribunal afforded to them under the Geneva Conventions has, rightly, found.

The wider command structure's failure to condemn, let alone prosecute, their use of civilians as human shields. Makes it reasonable to conclude that the Ukrainian armed forces as a whole is an unlawful armed group.

None of whose members and supporters are protected by the Geneva Conventions.