How can Israel react to this blatant onslaught by Iran?

The focus now is on Israeli Prime Minister Benjamin Netanyahu's options for responding to Iran's attack, which was mainly repelled by Israel's defenses and its partners.

"Israel's obligation to retaliate against Iran for its direct act of aggression does not detract even the slightest from the fact that the Iranian attack was a complete failure," said Jonathan Conricus, a Middle East expert and senior fellow at the Foundation for Defense of Democracies (FDD).

The remarks follow Iran's launch of more than 300 missiles and drones against Israel on Saturday, which Israel claims was mostly thwarted by its advanced defenses and the assistance of regional allies. Iran launched the strike from its own land.

But the brazen Iranian attempt has opened up questions about how Israel may choose to respond, even amid reports that the Biden administration has urged Netanyahu to show restraint in a bid to prevent an escalating conflict in the Middle East.

"It’s hard to conceive of a world in which Israel responds to Iran’s crossing of red lines by merely absorbing Tehran’s missile and drone strikes. It’s even harder to think of such a world in a post-October 7 Middle East," Behnam Ben Taleblu, a senior fellow at FDD focused on Iranian security, told Fox News Digital. "Despite two decades of alarm ringing over the Iranian nuclear program, Israel has thus far not overtly attacked Tehran’s nuclear program. One wonders the degree to which this may change as Israel prepares its response."

According to a report from the Jerusalem Post, such an attack on Iran’s nuclear capabilities has been the subject of years of planning, with the potential for a response to feature F-35 stealth fighter jets that would hit sites across Iran as far away as 1,200 miles from Israel.

The aim of such an attack would be to eliminate Iran’s air defenses, the report notes, paving the way for the Israeli military to strike at nuclear facilities hand-picked by the country’s intelligence.

But Israel would likely need to make sure its plans garner U.S. support, Conricus argued, adding that military strikes would not be the only option on the table.

"Israel has various long range capabilities to choose from, but what Israel has to ensure is U.S. support or at least approval, and to clarify the strategic objectives that it’s aiming for," Conricus said. "Israel could retaliate against the Iranian military nuclear program or against its economic infrastructure, ports and refineries, depending on which strategic objective it wants to achieve."

Overnight, Israeli forces pummeled Hezbollah targets in Lebanon in a barrage of airstrikes Sunday. Those attacks targeted a Hezbollah weapons manufacturing facility and other targets, the IDF said.

"A short while ago, IDF fighter jets struck a number of military structures in a complex belonging to Hezbollah's Radwan Forces in the area of Jbaa in southern Lebanon," Israeli forces said in a statement. "Earlier during the night, IDF fighter jets struck Hezbollah military structures in the areas of Khiam and Kfarkela."

According to the Jerusalem Post report, the wave of Israeli F-35s into Iran would likely be followed by separate waves of F-15 eagles, F-16 fighting falcons, and more heavily loaded F-35s carrying loads that could potentially penetrate deep into the ground to destroy Iranian nuclear facilities.

Israel could also use its own stockpile of surface-to-surface ballistic missiles and attack drones, the report notes.

While such an attack has been gamed out, Taleblu argued that it is unclear whether Israel would opt for such a dramatic response.

"Despite two decades of alarm ringing over the Iranian nuclear program, Israel has thus far not overtly attacked Tehran’s nuclear program," Taleblu said. "One wonders the degree to which this may change as Israel prepares its response."

Speaking with CNN Sunday, retired Gen. David Petraeus noted that Israel will have plenty of options if it chooses to launch a response, including both overt and covert military actions.

"They can pursue asymmetric attacks, cyberspace and so forth," Petraeus said. "And keep in mind that, of course, Washington is meeting with the other G7 countries to determine what kind of diplomatic and economic responses should follow in a coordinated effort as well."

But whatever Israel decides, Taleblu said that any plan will have to to come to a "theory of the case for victory."

"Would it be going for a decapitation strike against regime leadership, a defanging strike against the regime’s long-range strike assets, or military bases, or a punishment strike that could perhaps target the energy and oil sectors, which is the financial lifeblood of the Islamic Republic," Taleblu said.