Could be worse. My empire is in two entirely disjoint sections, but at least the empire between pieces is very friendly and invited me to a federation. I kind of had the same problem though. I have a rival on my western border that has comparable fleet power, and I have 3 different major routes of potential invasion I have to park fleets at for defense. It worked, since they never even declared war despite claiming 20 of my systems or so, but stretched my fleet very thin.
Then Skynet woke up.
I suddenly found myself with two 90K fleets and a 200K fleet in the middle of my empire, and I have three main fleets of about 20K power each in distant parts of my empire. I wasn't able to save the planet they spawned near.
As of right now, I've managed to destroy the roaming fleets by combining everything I had on top of the federation fleet
and multiple allied fleets joining me. I was actually a little shocked that the other AI empires actually sent ships to help.
But now I've got
nooooo idea what to do about that 200K doomstack protecting the purification hub. My fleet is already over cap and I'm losing energy credits. I can build a new battleship about once every 4 months, so trying to build up enough to fight it is going to take ages upon ages, by which time they're going to get reinforcements and probably eat most of the rest of the galaxy...