"What about the very large illegal settlements like Ariel, Nadav?" "Territorial Compropmise" is the name of the game, Clickie. That means not going back to the pre-1967 borders, because those were already the borders accepted by the non-Muslim world. It means drawing the borders somewhere in the middle, i.e., not the present borders and not the previous ones. So Ariel is up for negotiations.
World Jewish Congress: Nazi train treasures must go to rightful owners (Reuters)
from the article: PM dismisses Meshal comments that Israel's existence is a reality