A Russian mercenary group has ruthlessly executed one of its former members who defected to Ukraine – but how did he end up back in Russian hands?

Tortoise is a news start-up devoted to slow journalism. We take our time to tell stories that really matter. If you want more slow and considered journalism, you can become a member of Tortoise to get access to more of our stories, contribute to our journalism and join exclusive events.

Just go to tortoisemedia.com/friend and use the code Tomini50 to get a year's digital membership for £50.

Hosted on Acast. See acast.com/privacy for more information.