FCC is our enemy. You know that, we know that. They sent multiple armies through your lands, into ours. One of them turned around and headed back into your lands after we were in pursuit. There's no propaganda or here-say.
I wouldn't expect Raven to stop FCC (or anyone else) from passing through their lands peacefully. But when they send hostile armies into our lands, I would expect that those armies are no longer considered peaceful traders. So you're essentially saying that you will allow FCC to stack your borders with us, and they can skirmish in our lands and run back to the safety of Raven lands. I wouldn't call that a neutral stance.
Once someone establishes themselves as a hostile war party, they should no longer be offered your protections. Safe harboring war parties is not a neutral stance.