Late on Saturday night, local time, the United States carried out strikes against Iranian nuclear enrichment sites at Fordow, Natanz and Isfahan.
The US says it fired 30 submarine-launched missiles at the sites in Natanz and Isfahan, as well as dropping more than a dozen “bunker buster” bombs at Fordow and Natanz.
The kind of bomb in question is the extremely destructive GBU-57 Massive Ordance Penetrator, or MOP, which weighs around 13.5 tonnes.The attacks raise a lot of questions. What are these enormous bombs? Why did the US feel it had to get involved in the conflict? And, going forward, what does it mean for Iran’s nuclear ambitions?
What are ‘bunker busters’, and why are they used?
Bunker busters are weapons designed to destroy heavily protected facilities such as bunkers deep underground, beyond the reach of normal bombs.
Bunker busters are designed to bury themselves into the ground before detonating. This allows more of the explosive force to penetrate into the ground, rather than travelling through the air or across the surface.
Iran’s nuclear enrichment sites at Fordow, Natanz and Isfahan are built deep underground. Estimates suggest that Fordow for example could be 80m beneath the surface, and capped with layers of reinforced concrete and soil.
What is the MOP?
The bunker buster used in this particular operation is the largest in the US arsenal. Leaving aside nuclear weapons, the MOP is the largest known bunker buster in the world.
Weighing some 13.5 tonnes, the MOP is believed to be able to penetrate up to 60 metres below ground in the right conditions. It is not known how many the US possesses, but the numbers are thought to be small (perhaps 20 or so in total).
We also don’t know exactly how many were used in Iran, though some reports say it was 14. However, it is likely to be a significant portion of the US MOP arsenal.
Why does only the US possess this capability?
The US is not the only state with bunker-busting weaponry. However, the size of MOP means it requires very specialised bombers to carry and drop it.
Only the B2 stealth bomber is currently able to deploy the MOP. Each B2 can carry at most two MOPs at a time. Around seven of America’s 19 operational B2s were used in the Iran operation.
There has been some consideration whether large transport aircraft such as the C-130 Hercules could be modified to carry and drop the MOP from its rear cargo doors. While this would allow other countries (including Israel) to deploy the MOP, it is for now purely hypothetical.
Why has the US (apparently) used them in Iran
The Trump administration claims Iran may be only a few weeks from possessing a nuclear weapon, and that it needed to act now to destroy Iranian nuclear enrichment sites. This claim is notably at odds with published assessments from the US intelligence community.
However, Israel lacks bunker-busting weaponry sufficient to damage the deeply buried and fortified enrichment sites at Fordow, Natanz and Isfahan.
An F-15E Strike Eagle releases a GBU-28 ‘bunker buster’ laser-guided bomb, a smaller equivalewnt of the 13,600 kg GBU-57 ‘Massive Ordnance Penetrator’ believed to have been used in Iran. Michael Ammons / US Air Force
Only the MOP could do the job (short of using nuclear weapons). Even then, multiple MOPs would have been required to ensure sufficient damage to the underground facilities.
The US has claimed that these sites have been utterly destroyed. We cannot conclusively say whether this is true.
Iran may also have other, undeclared nuclear sites elsewhere in the country.
Iran’s reaction
The US has reportedly reached out to Iran via diplomatic channels to emphasise that this attack was a one-off, not part of a larger project of regime change. It is hard to say what will happen in the next few weeks.
Iran may retaliate with large strikes against Israel or against US forces in the region. It could also interrupt shipping in the Strait of Hormuz, which would affect a large portion of global oil shipments, with profound economic implications.
Alternatively, Iran could capitulate and take steps to demonstrate it is ending its nuclear program. However, capitulation would not necessarily mean the end of Iran’s nuclear ambitions.
The value of nuclear weapons
Perhaps a greater concern is that the attack will reinforce Iran’s desire to go nuclear. Without nuclear weapons, Iran was unable to threaten the US enough to deter today’s attack.
Iran may take lessons from the fate of other states. Ukraine (in)famously surrendered its stockpile of former Soviet nuclear weapons in the early 1990s. Russia has since felt emboldened to annex Crimea in 2014 and launch an ongoing invasion in 2022. Other potential nuclear states, such as Iraq and Gadaffi’s regime in Libya, also suffered from military intervention.
By contrast, North Korea successfully tested its first nuclear weapon in 2006. Since then there has been no serious consideration of military intervention in North Korea.
Iran may yet have the ability to produce useful amounts of weapons-grade uranium. It may now aim to buy itself time to assemble a relatively small nuclear device, similar in scale to the bombs used in Hiroshima and Nagasaki.
Depending on what facilities and resources have survived the US strikes, the attack has likely reinforced that the only way the Iranian regime can guarantee its survival is to possess nuclear weapons.
UK PM visits Beijing to strengthen trade and tackle security issues; insights from Professor Tim Harcourt on Brexit’s impact.
The British Prime Minister has made the first visit to Beijing in eight years, aiming to strengthen trade links and address growing security concerns with China.
Joining us to unpack the visit is Professor Tim Harcourt, Chief Economist at UTS, who discusses how Brexit has reshaped Britain’s approach and the delicate balance between economic opportunities and security commitments to the USA and NATO.
We also explore how China’s alliances with countries like Myanmar and Russia, along with Canada’s differing approach, influence trade relations, and what this visit means for Australia’s relationship with China.
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After months of speculation, President Donald Trump nominated Kevin Warsh on Jan. 30, 2026, to be the next chair of the Federal Reserve.
If confirmed by Congress, Warsh will inherit leadership of the U.S. central bank at a delicate time. For months, current Fed Chair Jerome Powell has come under attack from the Trump administration for failing to heed the president’s call for lower interest rates. The fight has put into question the central bank’s independence and its role in stewarding the economy.
But what should America expect from the next Fed chair? Here are three things to note about Trump’s nominee.
1. He is a familiar face …
Warsh brings deep experience with monetary policymaking to the role.
A graduate of Stanford University and Harvard Law School, he served as special assistant to the president for economic policy and executive secretary of the White House National Economic Council under President George W. Bush before becoming one of the youngest members of the Federal Reserve Board of Governors.
Warsh is no newcomer to discussions about Federal Reserve leadership. He was a finalist for the job in 2017, when Trump instead appointed Powell. Trump has since stated that he made a mistake by not selecting Warsh then – though clashes between Trump and Powell may have influenced that view.
Warsh’s credentials are unquestionable. As a governor of the Federal Reserve Board from 2006 to 2011, he worked closely with other policymakers and with Wall Street during the global financial crisis of 2008. Since departing the Fed, he has returned to Stanford as a visiting fellow at the Hoover Institution and a lecturer at the Graduate School of Business, as well as a member of the Panel of Economic Advisers of the Congressional Budget Office.
He also has ties to the finance industry. He began his career in mergers and acquisitions at Morgan Stanley and, since leaving the Fed, has worked as a partner at Duquesne Family Office, an investment firm that manages the personal wealth of hedge fund manager Stanley Druckenmiller and other investors.
The big question people have is what a Warsh Fed would mean for monetary policy – that is, is it likely to play tight or loose with rates.
When the economy is growing quickly, like in 2021, the Federal Reserve tightens policy by raising interest rates to avoid the kind of economic growth that may not be sustainable long term and can lead to bubbles. However, during downturns, like in 2008 or 2020, the economic policy that can provide a backstop for the economy is looser. The Fed tends to lower rates in these situations, which supports growth.
Warsh’s views on monetary policy have long been considered hawkish, meaning he is inclined toward tighter policy and generally higher interest rates to keep inflation in check, even at the expense of slower economic growth. During his previous tenure at the Fed, he signaled concern about expansive monetary tools such as quantitative easing, in which the central bank buys Treasurys and other securities to stimulate the economy. This resulted in what Warsh called a “bloated” Fed balance sheet that held almost US$9 trillion of debt at its peak in 2022.
A central question surrounding this nomination is whether it promotes the politicization of the Federal Reserve.
The Fed’s independence from day-to-day political pressure has long been viewed as a cornerstone of U.S. economic policymaking. Decisions about interest rates, inflation control and financial stability are insulated from electoral politics for that reason. A truly independent Fed can resist making decisions that provide a short-term economic bump – something incumbent governments tend to like – but may lead to longer-term economic pain down the road.
The Fed tends to use its monetary policy tools carefully. Yet politicians tend to want looser monetary policy so the economy grows fast and they get credit for it.
And Warsh’s nomination can be seen in the context of a broader push from the executive branch to exert greater influence over monetary policy. Given Trump’s public criticism of Powell and vocal calls for his early departure, the president almost certainly intended to nominate someone who would lower interest rates according to preferences stated by the administration.
Critics of the nomination have argued that Warsh has a tendency to be more opportunistic with his policy views than Powell and other economists, who try to ignore political preferences.
As such, Warsh’s nomination encapsulates more than just a leadership transition. It highlights the ongoing tensions between political priorities and the traditional economic playbook, between short-term growth pressures and long-term stability, and between institutional independence and democratic accountability.
Time will tell whether he turns out to be hawkish or politically motivated as chair, if he is confirmed.
With Russian ground troops bogged down in a grinding war of attrition, Moscow is striving to press home its advantage in the skies – through an ever-evolving army of drones, courtesy of Iran.
In early January, wreckage of a drone found in Ukraine hinted at a new high-speed model of drone being deployed by Russia in the conflict. It prompted Ukraine President Volodymyr Zelenskyy to air fears over failing to keep pace. “We produce (drones) at about 1,000 a day. We really produce them, but it’s not enough. It’s still not enough,” he told an audience of political business leaders at the World Economic Forum on Jan. 22, 2026.
Ukrainian intelligence suggests that Moscow, too, will also soon be pumping out 1,000 drone units a day, in large part thanks to the support and technical assistance of Iran. A central concern for Ukraine is Russia’s increasing production of long-range attack drones that it has used in mass attacks to strike targets in Ukraine.
Tehran’s role in supplying Russia with hundreds of long-range, kamikaze-style drones is long known. But what has gone largely unnoticed outside Ukraine is Iran’s central role in teaching Russia to produce these drones itself.
Both Ukraine and Russia have ramped up drone production since the beginning of the current conflict in February 2022.
Russia was initially unable to produce large numbers of kamikaze drones, and the country’s military seemingly did not at first understand the decisive role long-range strike drones could play. Instead, Moscow invested in traditional battlefield weapons, such as missiles. It mainly thought of drones as carrying out the roles of intelligence, reconnaissance and surveillance.
Since probably about early 2022, Tehran has been providing drones and drone technology to Russia for use in Ukraine. Later that year, Russia and Iran signed the agreement to set up a production plant in Russia for Iranian-designed attack drones.
With Iranian blueprints and technology, a production plant in Tatarstan in western Russia now produces large numbers of drones originally designed by Iran. At this factory, Russia manufactures the Geran-2, Moscow’s name for the Iranian Shahed-136 strike drone.
Easily identifiable by its delta-wing shape, the drone has optimized certain design features, such as range, endurance and weight capacity. It can carry an estimated 90 to 110 pounds of explosives hundreds of miles.
Meanwhile, the delta-wing design optimizes precision diving, helps prevent stalling at low speeds, and increases the drone’s stability during the attack phase.
These features enable targeting of strategic infrastructure at much less cost than long-range missiles.
Russia can now produce hundreds of one-way Geran-2 attack drones a day. It may soon be able to launch thousands in salvos.
Russia is also modifying and enhancing the drones with features such as precise navigation, heavier warheads and new engines.
Some reports claim Russia is testing telemetry and video links to fly drones remotely, a significant improvement over its current preprogrammed design that would improve accuracy and range. Iran also supplied Russia with technology to build a jet-powered drone variant based on the Shahed-238 that can fly faster.
Called the Geran-3, Russia has produced and used fewer of these drones, whose jet power makes them more challenging for Ukrainian air defense to detect and intercept. New generations of the drone – Geran-4s and Geran-5s – have since been rolled out and apparently deployed in the war with Ukraine.
Sanctions-busting procurement
Even with the blueprints and Iranian assistance, Russia is still reliant on Western and Chinese suppliers for some drone components, many of them commercial, off-the-shelf technology. These include the engine, fuel pump, GPS and navigation systems, semiconductors and components for antennas.
To assist Russia, Iran exploits its networks of brokers and companies in acquiring Western components to evade international sanctions.
A procurement network headed by the Iranian company Sahara Thunder used shipping firms in the UAE and India to sell Russia the original Iranian drones and components and to negotiate the deal for the production plant.
The U.S. Treasury Department has sanctioned this firm and others involved in the drone sales, but Iran set up new companies to help Moscow acquire components. Multiple studies and reports documenting the inclusion of foreign components in downed Geran-2s show Moscow’s continued acquisition of these parts, almost certainly with Iranian assistance.
A weapon of terror
Russia uses the Geran and other longer-range Iranian and Russian models to purposefully target civilians and civilian infrastructure in Ukraine, including residential housing in Ukrainian cities. Russia has even targeted first responders and humanitarian distribution points, according to a United Nations account.
In fact, the U.N. concluded in October 2025 that Russia’s use of short-range, unmanned aerial vehicles against civilians in southern Ukraine constituted a crime against humanity and a war crime.
A two-day attack in May 2025 on the Ukrainian cities of Kharkiv in the northeast and Odessa in the south highlights the destructive power and human cost of the drone attacks. According to accounts in the Kyiv Post, Russia launched over 100 drones. In Kharkiv, three blocks were burned down, including 90 shops, and two people were injured. In Odessa, the drones killed one person and damaged residential buildings.
Beyond psychologically tormenting the Ukrainian population, these drones have a profound effect on the battlefield.
Ukraine has responded to Russia’s battlefield success with the Iranian-designed drones by diversifying the types of drones it manufactures, attacking Russian infrastructure for manufacturing drones and developing counter-drone technologies.
Iranian families watch a video clip of Iranian-made unmanned aerial vehicles during a ceremony commemorating the 45th anniversary of the Iran-Iraq war in Tehran on Sept. 25, 2025. Morteza Nikoubazl/NurPhoto via Getty Images
Iran is unlikely to stop its assistance anytime soon, given its own economic problems. Helping Moscow obtain drone components and even modify new versions of the Geran-2 will also benefit Iran militarily as it, too, learns to make the new drones and use them itself.
But the main beneficiary of this relationship is Moscow. Without Iranian support, Russia would face more difficult trade-offs on the battlefield. The lower-cost drones allow Russia to preserve its expensive advanced missiles for the most significant targets in Ukraine and to employ large swarms of drones to target Ukrainian infrastructure.
And with the ground offensive yielding little progress of late for Moscow, that could be crucial as the war enters its fifth year.