Mordechai Vanunu did not crack Israels "nuclear ambiguity", he smashed it. France and America helped develop Israels nuclear capabilities. Vanunu and others exposed it. It is only the Israeli love of deception for its own sake that keeps the concept of "nuclear ambiguity" current.
North Korea insists it 'regrets,' not apologizes, over mine blast that killed 2 South soldiers (AP)
from the article: A secret guard for nuclear ambiguity