In my opinion....Abbas should try to go into negotiations and drop the settlement freeze precondition. In fact, for me it is not, but just to have a look at what Israel would do, Abbas should Negotiate. But, when No progress is achieved in a limited time frame, i would resort to the ICC.
Supreme Court rejects plea for freeze on expansion of asylum seekers' detention (Haaretz)
from the article: Under pressure from Kerry, Abbas softens preconditions for peace talks