Maybe if you actually participated and made yourself noticeable to the waring countries you would have been involved in the treaty? I'm sorry, I just don't see logic in not doing anything whatsoever to help anybody then at the last minute say, "No, the whole thing is voided."
It's not like your treaty never happened, it was illegally declared. You should have consulted with every nation that attacked the USC, including Syriiak. Unless I'm mistaken, he led the assault on the USC, ya think he should know if his war was ending?
If you had signed a simple treaty between yourself and the USC ceasing hostilities it would have been fine, however you and blazer decided to sign an end of war treaty that would condition the release of USC coast line by Syriiak, without their consent, and it would bar me from eventually attacking. Thus once again, void.
Unless you'd like my nation to violate your self-proclaimed military power over the USC and begin mortaring their cities.