The details remain unclear, but it's widely thought that he was killed by a precision drone strike at his residence. The world is watching to see whether Iran and/or its Resistance Axis allies will respond, what form it could take if so, and whether that would escalate tensions to a wider war.

Here are five takeaways thus far:

1. Israel's Intelligence & Tactics Are Top-Notch

Israel somehow or another obtained accurate intelligence about Haniyeh's location despite it being top-secret and was then able to successfully assassinate him. Whatever air defenses (including electronic warfare ones) that Iran had deployed in its capital as part of the security measures to protect its high-profile guests failed to thwart this attack. This is a major embarrassment for the Islamic Republic and prompts speculation about whether it was due to utter incompetence or was partially an inside job.

2. Iran Is Caught In A Dilemma Over How To Respond

It's unimaginable that Iran won't respond to its Israeli enemy assassinating a high-profile allied guest in Tehran during the new president's inauguration, but the dilemma is over the form that this response will take. Launching another drone and missile salvo against Israel like it did in the spring after the bombing of its consulate in Damascus is possible, though Israel could spin that as a failure if many of them are shot down like last time, the on-the-ground damage is minimal, and no high-profile targets are killed.

3. Mutually Assured Destruction Hangs Heavy Over Everyone's Head

The response that Iran resorts to will be determined by its leadership's understanding of how far they can go without triggering the "mutually assured destruction" (MAD) scenario, which both Israel and the Resistance Axis fear and is why they've thus far restrained themselves from waging all-out war. A repeat of spring's salvo could remain below that threshold, but Iran might also respond in a different way that's interpreted by Israel as an escalation, thus prompting its own escalation that could then lead to MAD.