I'm in the middle of playing a Tough Huge game. Two turns ago the Dregnin surrendered to Korx after I took about 90% of their planets. I'm playing as the Torian and my population is at about 50% capacity on most of my planets from filling up transports to invade Dregnin planets.
So since the war has ended, I decide to switch back to doing some planetary improvements. I research Soil Enhancement and start that on all my planets.
The next turn one of my planets is Invaded by the Iconians. What's weird is, there was no delcaration of war. Just popped up the invasion screen. I repelled them and was preparing to counter attack. I moved a ship into position to attack and it says Attacking the planet will be a declaration of war. I check the foreign stats screen and I'm not at war with Anyone??? So how did the Iconians attempt to invade one of my planets without declaring war?