USS Firefly wrote:
But why is there a Borg cube on the cover of "typhon pact Bestien"?
Because the first chapter focuses on a battle towards the end of the Borg incursion that involved Sisko and Vaughn.
It does seem a little silly having it on there, but what can you do? One of the reasons why the Typhon Pact was created was because those powers believed being together was better than opposing each other and the Borg incursion was a big part of that.