Once again underscoring the profound disconnect between Israeli Prime Minister Benjamin Netanyahu and his nation’s security apparatus, the Israeli military has held a “closed door” briefing in which they seemed to praise the P5+1 nuclear deal with Iran, saying it provided “security benefits” for Israel.
Though the details of the briefing were not supposed to be fully made public, some details got out, including the military saying that the deal, and increased inspections, would provide increased clarity on Iran’s civilian nuclear program and the risks of a “breakout” to military use.
Netanyahu has repeatedly and loudly condemned the talks, claiming any deal with Iran on any terms would be a threat to Israel’s existence. The military, however, said it believed the threat from Iran was waning, and would more so with a nuclear deal.
Netanyahu has struggled to keep military and intelligence officials backing his public narrative, and earlier this year Israeli intelligence briefed the US Congress against imposing sanctions demanded by Netanyahu on the grounds it would sabotage diplomacy. Netanyahu’s pre-election visit to the US Congress was the result of efforts by him and hawkish Congressional leaders to try to undo the “damage” done by the briefing.
A nuclear deal is beneficial to Iran from a military point of view. They prefer a situation where they can display their strength and capability while at the same time the intensive monitoring enables them to convincingly claim they're not building nukes. It's a good antiproliferation strategy, as in strong but not aggressive. The constant propaganda about iranian nukes on the other hand can be considered a proliferation strategy. It encourages the neighbors to retaliate in kind . In practice it appears that the neighbors aren't much inclined to start building nukes anyway.
For Israel the issue is that if they prefer a weak Iran but if Iran gets stronger , well, okay then. That's fine too.