Ok, I've played the second save which I got from turntracker. Indeed a message popped up at the end of previous turn stating that Japan and Celts are at war. I don't remember who declared on who because it was very brief and I clicked on it. It might be you have coupled peace with some deal and that deal was broken in the process of some war.
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Cujusvis hominis est errare; nullius, nisi insipientis in errore perseverare
Ciceron (Marcus Tullius)
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