From the discussion so far it would seem the block is within Israel and why it wont compromise, whats at the root of that in your opinion , is it fear?, is it distrust of its neighbours, is it distrust of europe due to historical reasons and other areas where international support comes from , a combination of all or something else entirely?
How can we reach out to allay their fears if thats the case and is enough being done already to do that by everyone involved?