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How Missile Defense Works (and Why It Fails)

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How Missile Defense Works (and Why It Fails)

Once a ballistic missile is fired into the air, a defender has only minutes to identify its precise trajectory and try to shoot it down.

The target, an enemy warhead, is inside an object about the size of a car that typically flies through the edge of space at many times the speed of sound.

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In April and October, Iran launched two of the largest ballistic missile attacks in history at Israel. The world’s most advanced missile defense systems, deployed by Israel and the United States, stopped some of the missiles — but not all of them.


Neither attack caused major damage, but some Israeli and American officials said it may have been a matter of luck that it was not worse. After Israel struck back at Iran last week, Iranian officials threatened another round of retaliation, although their plans remain unclear.


Here’s why stopping a ballistic missile attack is hard.

Ballistic missiles like the ones Iran fired last month escape the atmosphere and accelerate to great speeds as they fall back down to Earth. It took only about 12 minutes for Iran’s missiles to reach Israel, analysts estimate. But there was far less time to make critical decisions about how to stop them.

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Within seconds, satellites must detect the heat signature given off by a missile launch. Radars must find the missile and try to calculate its exact course.

A defensive missile called an interceptor must be fired soon after that to reach the incoming missile in time.

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That’s all hard enough with one missile. But Iran fired a large volley of them last month — nearly 200 ballistic missiles in less than an hour. The goal appeared to be to overwhelm Israeli defenses.


Radars can only track so many targets at once, and launchers, once emptied, may need a half hour or more to reload.

Beyond that, if they are concerned about future attacks, targeted countries may also need to make a critical split-second decision to reserve valuable interceptors only for the incoming missiles that appear likely to do the most damage.

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After Iran’s second barrage, in October, Israel said its defense systems had shot down many of the missiles, and those that struck appear to have caused limited damage.

But satellite imagery does show that the barrage, which analysts said used more advanced missiles, left dozens of craters at one air base, Nevatim. Had those missiles landed in a populated area, the death and destruction could have been extensive.

Israel’s best-known defense system, the Iron Dome, was built to stop short-range rockets, and is too slow and limited when it comes to ballistic missiles. For that, Israel relies on several more advanced layers of defense designed to counter ballistic missiles at different stages of flight.

The most advanced systems, long-range interceptors like the Arrow 3, operate in space, where ballistic missiles like those Iran fired spend most of their time. They are the first chance to stop a missile, but high above the atmosphere, there is no room for error.

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Both an interceptor and an enemy missile shed the boosters that power them into space. Just two smaller vehicles remain, hurtling toward each other.

The interceptor seeks a direct hit to destroy the warhead. To home in, the interceptor carries sensors to track the enemy missile and thrusters to move toward it. But by the time an interceptor senses its target a mile away, it has only a split second to adjust.

That’s because missiles like Iran’s latest are only about three feet wide at the base by the time they are in space, and they are traveling about two miles every second.

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If that weren’t hard enough, some ballistic missiles carry decoys to trick the interceptor. Debris leftover from the boosters can also confuse it.

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It’s unclear how often interceptions above the atmosphere actually work. Governments tend to avoid disclosing specific interception rates, and they have every reason to present a positive picture, even when interceptions fail. So do the companies that manufacture the pricey systems.

When combined with U.S. antimissile systems in the region, Israel currently has the most layers of missile defense in the world. If outer-layer defenses fail to stop a missile, shorter-range systems that intercept missiles closer to the ground may have another chance.

But time runs out quickly. The closer a ballistic missile gets, the more dangerous it becomes. And even if a lower-altitude intercept is successful, the resulting debris can still be deadly.

If a missile succeeds in re-entering the atmosphere, often less than a minute remains before it strikes.

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Defenses that work in the upper atmosphere — like Israel’s Arrow 2 or the THAAD system that the United States recently sent to Israel — must fire their interceptors within seconds.

As the missile nears the ground, close-range defenses like the Patriot system from the U.S. provide a final chance to stop it. But these systems have a range of about 12 miles and can only protect limited areas.

An attacker can draw on a variety of tactics. To distract the enemy, it can fire a volley of cheaper weapons timed to arrive at the same time as the ballistic missiles. This is what Iran tried in its April attack, but Israel and its allies appear to have been able to triage between the faster and slower weapons, using other defenses like fighter jets to counter them.

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Israel’s retaliatory strike at Iran last week targeted missile production sites and degraded Iran’s ability to produce the kind of missiles it fired in October. The attack damaged at least one rocket production facility, as well as fuel mixers that make propellant for Iran’s missile fleet.

It is unclear how Iran will respond or whether it will fire another round of ballistic missiles, but if it does, the fundamental imbalance of missile warfare will remain: Firing a ballistic missile is a lot easier than stopping one. And making a ballistic missile is cheaper and faster than making an interceptor to shoot one down.

Over the course of a protracted conflict, it could become a question of which side runs out of missiles first.

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Venezuelan dissident Machado credits Trump for advancing freedom movement, dedicates Nobel to him

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Venezuelan dissident Machado credits Trump for advancing freedom movement, dedicates Nobel to him

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FIRST ON FOX: Venezuelan opposition leader María Corina Machado is crediting President Donald Trump for helping sustain Venezuela’s pro-democracy movement while dedicating her Nobel Peace Prize to him, telling Fox News Digital that he provided critical support at a moment when Venezuelans felt abandoned by the international community.

“I am absolutely grateful to President Trump for every gesture, every signal and every moment that he has stood with the Venezuelan people. I have watched it very closely, and I know what it has meant for those who are fighting to reclaim democracy and freedom in our country,” she stated.

“A free and democratic Venezuela is not only possible — it is closer than ever. And that free Venezuela is breathing louder than ever before,” Machado said, adding that her Nobel Peace Prize is also dedicated to Trump. “This Nobel Prize is symbolic of that fight for freedom and is dedicated to the Venezuelan people and to President Trump for showing what strong leadership looks like in the moments that matter most.”

EXPERT REVEALS WHAT IT WOULD TAKE FOR TRUMP TO DEPLOY TROOPS TO VENEZUELA: ‘POSSIBILITY OF ESCALATION’

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Nobel Peace Prize laureate Maria Corina Machado waves at the Grand Hotel in Oslo, Norway, early Thursday, Dec. 11, 2025. (Lise Åserud/NTB Scanpix via AP)

An official familiar with the matter told Fox News Digital that Machado hopes to visit the U.S. and meet the president to formally honor him for what she views as his support for the Venezuelan people.

Machado’s remarks come as she re-emerged publicly in Oslo, Norway, after spending 11 months in hiding. After a brief detention during an anti-government protest in Caracas, she went underground as pressure from the Maduro government intensified.

Her return to the public eye coincided with the Nobel Peace Prize ceremony, where her daughter, Ana Corina Sosa, accepted the award on her behalf. The Associated Press reported that Machado waved to cheering supporters from a hotel balcony — her first public appearance in nearly a year.

SCHUMER ACCUSES TRUMP OF PUSHING US TOWARD ‘FOREIGN WAR’ WITH VENEZUELA

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The daughter of the Nobel Peace Prize laureate, Ana Corina Sosa, accepts the award on behalf of her mother, Venezuelan opposition leader Maria Corina Machado, during the Nobel Peace Prize ceremony at Oslo City Hall, Norway, on Dec. 10. (Ole Berg-Rusten/NTB Scanpix, Pool via AP)

Machado was barred from running in the 2024 presidential election despite winning the opposition primary by a wide margin, a move that drew strong criticism from Western governments.

Roxanna Vigil, a fellow at the Council on Foreign Relations, told Fox News Digital that Machado remains “the most popular political figure in Venezuela,” adding that she secured “over 90% of the vote” in the opposition primary before being blocked by Maduro. “She became a real threat… and so they disqualified her from running,” Vigil said. Machado ultimately endorsed Edmundo González, who went on to win the election.

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Venezuelan opposition leader Maria Corina Machado addresses supporters at a protest against President Nicolas Maduro in Caracas, Venezuela, Thursday, Jan. 9, 2025, the day before his inauguration for a third term. (AP Photo/Ariana Cubillos)

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Machado ultimately endorsed González, who was widely regarded by independent tallies of the result as having won the 2024 election, but who did not assume the presidency after Venezuela’s official National Electoral Council, controlled by Maduro allies, declared Nicolás Maduro the winner and inaugurated him for another term.

Machado has signaled she intends to return to Venezuela when conditions allow and continues to call for a peaceful transition away from Maduro’s rule.

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Residents emerge in DR Congo’s tense Uvira after M23 rebel takeover

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Residents emerge in DR Congo’s tense Uvira after M23 rebel takeover

A cautious calm has settled over the eastern Democratic Republic of the Congo (DRC) city of Uvira in South Kivu province, as residents begin emerging from their homes following its capture by M23 rebels.

The capture earlier this week threatens to derail a United States-brokered peace agreement, signed with much fanfare and overseen by President Donald Trump a week ago, between Congolese and Rwandan leaders, with Washington accusing Rwanda on Friday of igniting the offensive.

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Regional authorities say at least 400 civilians, including women and children, have been killed in the violence between the cities of Bukavu and Uvira, both now under M23 control.

Al Jazeera is the only international broadcaster in Uvira, where correspondent Alain Uaykani on Saturday described an uneasy calm in the port city on the northern tip of Lake Tanganyika, which sits directly across from Burundi’s largest city, Bujumbura.

Uaykani said government and allied militias, known as “Wazalendo”, which had been using the city as a headquarters, began fleeing even before M23 fighters entered.

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Residents who fled as the Rwanda-backed group advanced have begun returning to their homes, though most shops and businesses remain shuttered.

“People are coming out, they feel the fear is behind them,” Uaykani said, though he noted the situation remains fragile with signs of intense combat visible throughout the city.

Bienvenue Mwatumabire, a resident of Uvira, told Al Jazeera he was at work when fighting between rebels and government forces broke out, and he heard gunshots from a neighbouring village and decided to stop, but said that “today we have noticed things are getting back to normal.”

Baoleze Beinfait, another Uvira resident, said people in the city were not being harassed by the rebels, but added, “We will see how things are in the coming days.”

M23’s spokesperson defended the offensive, claiming the group had “liberated” Uvira from what he called “terrorist forces”. The rebels say they are protecting ethnic Tutsi communities in eastern DRC, a region that has seen fighting intensify since earlier this year.

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The offensive, which began on December 2, has displaced more than 200,000 people across South Kivu province, according to local United Nations partners.

Rwanda accused of backing rebels

South Kivu officials said Rwandan special forces and foreign mercenaries were operating in Uvira “in clear violation” of both the recent Washington accords and earlier ceasefire agreements reached in Doha, Qatar.

At the UN Security Council on Friday, US ambassador Mike Waltz accused Rwanda of leading the region “towards increased instability and war,” warning that Washington would hold spoilers to peace accountable.

Waltz said Rwanda has maintained strategic control of M23 since the group re-emerged in 2021, with between 5,000 and 7,000 Rwandan troops fighting alongside the rebels in Congo as of early December.

“Kigali has been intimately involved in planning and executing the war in eastern DRC,” Waltz told the UNSC, referring to Rwanda’s capital.

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Rwanda’s UN ambassador denied the allegations, accusing the DRC of violating the ceasefire. Rwanda acknowledges having troops in eastern DRC but says they are there to safeguard its security, particularly against Hutu militia groups that fled across the border to Congo after Rwanda’s 1994 genocide.

The fall of Uvira has raised the alarm in neighbouring Burundi, which has deployed forces to the region. Burundi’s UN ambassador warned that “restraint has its limits,” saying continued attacks would make it difficult to avoid direct confrontation between the two countries.

More than 30,000 refugees have fled into Burundi in recent days.

The DRC’s foreign minister urged the UNSC to hold Rwanda accountable, saying “impunity has gone on for far too long”.

A report by the American Enterprise Institute’s Critical Threats project said Rwanda provided significant support to M23’s Uvira offensive, calling it the group’s most consequential operation since March.

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Al Jazeera’s UN correspondent Kristen Saloomey said UNSC members were briefed by experts who noted that civilians in DRC are not benefitting from the recent agreements negotiated between Kinshasa and Kigali.

More than 100 armed groups are fighting for control of mineral-rich eastern DRC near the Rwandan border. The conflict has created one of the world’s largest humanitarian crises, with more than seven million people displaced across the region.

The M23 group is not party to the Washington-mediated negotiations between DRC and Rwanda, participating instead in separate talks with the Congolese government hosted by Qatar.

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Video: Deadly Storm Causes Massive Flooding Across Gaza

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Video: Deadly Storm Causes Massive Flooding Across Gaza

new video loaded: Deadly Storm Causes Massive Flooding Across Gaza

Nearly 795,000 displaced people in Gaza were at risk of dangerous floodwaters, according to the United Nations. The heavy rain and strong winds flooded makeshift shelters and collapsed several buildings, according to the Gaza Civil Defense.

By Jorge Mitssunaga, Nader Ibrahim and Saher Alghorra

December 12, 2025

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