Iran's nervousness can only increase as they strive to obtain nuclear weapons, because if upon obtaining that capability they are ever militarily punished for their proxy actions, they run a risk of total obliteration should they use a nuke(s) in retaliation. Should they ever respond in a non-nuke way to any punitive attacks for their proxy actions, they know they will lose their nuke facilities as a precautionary measure in the second round of retaliation. The only logical thing to do is slip a few billion under the table to Israel and have them take out Iran's nuclear capability now. After all, Israel is already the villain over there and that is exactly what villains do.