I believe that the state of Israel, having been created as a sanctuary for people who had been threatened by the ultimate threat - extermination, needs the ultimate protection corresponding to its geography. Israel would need a nuclear umbrella anyway, be it from the US or other nations, or be it Israeli. I don't see the point arhuing about that. Israel never threatened any other state of extermination. It has been threatened a number of times of extermination. It has a right to an adequate protection.
Russia: U.S. plan to provide air cover for Syrian rebels undermines Damascus fight on ISIS (Reuters)
from the article: UN nuclear watchdog seeks to persuade Israel to join NPT