Lets say I setup a game 3v3, and I'm sweden, will I automatically get the 20% bonus from having 2 allies?
I suppose it does not. I'm in a 12v12 team-game. I've made two declaration of friendships with 2 members of team 2 (me being on team 1 of course).
As you can see from my screenshot, you only receive the bonus specifically from the DoF which does not include teammates. Unfortunately :(