Israel has moved closer to a Theocratic and Apartheid state the last few years and Jews have special rights others do not, like RoR, able to rent state lands, easier to get permits to build or start business and so on. The main threat to Israel is if Iran gains more influence in Arabs countries and turns them against Israel and nukes would help them in that goal. So Arab countries more at risk now than Israel over nukes but long term Israel could be at greatest risk.
Saudi FM: We hope Iran uses sanction relief for development, not nefarious activities (Reuters)
from the article: Russia to begin loading fuel into Iran's nuclear reactor next week