I was just playing a game where after a prolonged war the chinese asked for peace. I took a fair amount of gold off them in return for 10 turns of peace. Now normally I have stuck to this 10 turns at least, and then returned to fighting soon after but this last game i got itchy for a fight sooner. Well while playing around i went to the current treaties section and then cancelled it. I sort of felt like i had cheated as i thought these treaties were unbreakable. What im asking in a really long winded way is are they supposed to be unbreakable, did i find a dodgy way to circumvent this or are you meant to be able to cancel a peace treaty early? One of the side effects seems to be really really high war weariness now though. No one in my country seems impressed with my pointless war with china.