I actually had a hand on one of the JV contract. I have to keep quiet thus I am not going to details. But what I can tell you is that, to sign one JV contract requires both party fully committed to each other, somewhat like a marriage certificate in real term for your understanding. Once JV is signed the only way out is for both party to reach mutual agreement. Early termination provisions only cover very extreme situations (e.g. bankrupt, withdrawn from business, legislation changes...etc). To join another alliance is never the excuse of mutual understanding.