The Isrealis have always embraced being a bit of a loose cannon geopolitically. It's smart; it let's them punch oabove their weight if they're careful about it

The Isrealis have always embraced being a bit of a loose cannon geopolitically. It's smart; it let's them punch oabove their weight if they're careful about it (which they normally are). My bet is they did this with the US's knowledge, but not involvement or approval. Israel doesn't want Iran going into the JCPOA without their nuclear program being set back as far as possible to square one. The US knows that it's an uphill battle to get the Iranians at the table at all, and would defer dismantling of their nuclear program to the outcome of the negotiations.