Minor Warmongers launching maritime attacks/spawning out of nowhere?

[barbanel]

Hi everyone,

I'm playing a Multiplayer Republica/Oceania game on slowest Tech speed, and I had this strange (and terrible) situation where a Minor regime spawned out of nowhere besides my capital city on turn 11.

I'm sending the screenshots. What's the explanation for this? Can minors also do MTH invasions and expand overseas?

[ShadowEmpireHost]

I will take my best guess:
1. Pirate MTH helped warmongers cross
2. Warmongers get some sort of Makeshift/Private port
3. Zone automatically forms around minor ports (you can create two zone minors if you're able to separate their port from their city this way)
good luck taking your new zone