I've noticed that fleet actions are offered as an option (via the window that pops up) but sometimes it just sucks me in anyway and I get blown away--when I did not elect to enter. Why make it a choice if we're going to get thrown in? I'm hoping they fix this.
If you fly in close proximity to an active Deepspace Contact (appearance is a ship that belongs to one of the enemy factions, and not the red cloud), they can and will target you in order to suck you in. It's obviously been designed to do this, just take your time to keep your distance.