5 Places World War III Could Start Right Now

Key Points and Summary – If World War III starts in 2025, odds are it begins in one of five places: the Taiwan Strait, NATO’s eastern front, the Israel–Iran theater, the Korean Peninsula, or the India–China Himalayas.

-Each flashpoint has its own fuse—unfinished wars, shifting deterrence, or alliance commitments that could drag in great powers quickly.

-The common thread is miscalculation under pressure: gray-zone tactics, drones and missiles, and crowded airspace where seconds matter.

-This op-ed maps the risks, why they’re worse now than a decade ago, and what practical steps—hard power, clear red lines, and real crisis channels—can keep the sparks from becoming a firestorm.

Five Places World War III Could Begin In 2025

I have been studying international affairs in global politics for a few decades now. The biggest fear I have is simple: where could the next great war start?

And to be clear, we are talking about World War III. While many say that such a conflict is impossible, the last twenty-five years of human history clearly prove that even the impossible is now truly possible.

An F-16 Fighting Falcon approaches the boom of a KC-10 extender aircraft during an aerial refueling mission out of Luke Air Force Base, Ariz., Nov. 16, 2016. F-16 pilots train on aerial refueling operations to be prepared for longer mission requirements. (U.S. Air Force photo by Senior Airman James Hensley)

Below, I have done my best to identify five places where I think World War III could occur. Clearly, five places are pretty limiting, and I did not rank them; I will let you, the reader, do that. Let the debate begin…

The Taiwan Strait And The First Island Chain

Talk to any Pacific planner and the conversation gets blunt fast: Taiwan is the hinge. Beijing has tied national prestige and regime legitimacy to “reunification,” while Taipei has hardened its defenses and Washington has moved—if unevenly—toward more explicit support. The danger is not only a D-Day-style invasion. It’s a blockade-plus-coercion campaign: air and maritime “exercises” that become a rolling quarantine, missiles fired as “tests,” cyber strikes on power and ports, and just enough ambiguity to make outsiders hesitate.

The geography is unforgiving. The Bashi Channel and Miyako Strait funnel traffic; the U.S., Japan, and the Philippines can’t ignore strangled sea lanes.

U.S. Air Force A-10 Thunderbolt IIs and an HC-130J Combat King II assigned to the 355th Wing taxi in formation on the runway at Davis-Monthan Air Force Base, Arizona, Feb. 9, 2022. The 355th Wing maintains and operates A-10 Thunderbolt IIs, HH-60G Pave Hawks and HC-130J Combat King IIs ensuring its Airmen and aircraft are ready to fly, fight and win. (U.S. Air Force photo by Senior Airman Alex Miller)

A crisis here would not stay local. Even a “limited” attempt to throttle Taiwan’s commerce would force U.S. and allied ships and aircraft to challenge a fait accompli. China’s layered anti-access network—long-range missiles, submarines, maritime militia—would meet allied submarines, bombers, and fighters across the entire First Island Chain.

Things could go sideways in a heartbeat: a missile misidentified as a warning shot, a fighter collision over gray water, a submarine contact prosecuted too aggressively.

If great powers start trading fire over the Strait, supply chains reel, markets panic—and the ladder to general war appears in front of us.

NATO’s Eastern Front: Ukraine, The Black Sea, And The Baltic Tripwire

The war in Ukraine already sits next to NATO’s fence line. Every missile that strays into allied airspace, every drone wave that tests the seams of air defenses, is a reminder that the margin for error is slim. The Black Sea is a special worry: crowded with surveillance assets, increasingly lethal coastal missiles, and naval drones that don’t always see each other until it’s too late. A downed manned aircraft or a sunken frigate—Russian, Ukrainian, or NATO—could create a political demand for retaliation that outruns prudence.

Then there’s the Baltic theater, where short distances and hard borders magnify risk. Kaliningrad is a thorn and a target; the Suwałki Gap is a vulnerability NATO planners have circled for two decades.

A rare occurrence of a 5-country multinational fleet of the NATO countries, the Netherlands, France, the United States, Italy, and the United Kingdom, during Operation Enduring Freedom in the Oman Sea. Image Credit: U.S. Navy

If Moscow decided to test Article 5 with deniable sabotage, airspace harassment, or a manufactured refugee surge, the tripwire could become a tug of war. The nightmare is a tit-for-tat that grows teeth: more air defenses forward, then more long-range fires, then a skirmish that leaves casualties on the wrong patch of ground.

Once alliance credibility is publicly wagered, it’s hard to cash out without escalation.

The Levant To The Gulf: Israel–Iran And The Risk Of A Chain Reaction

The Israel–Iran conflict is no longer a shadow war. Missile and drone exchanges have crossed red lines, regional proxies have tested maritime chokepoints, and precision strikes have hit sites that once seemed off-limits.

The lesson of the last year is simple: both sides now believe they can absorb and dish out punishment without triggering full-scale retaliation. That is precisely how miscalculation happens. Tehran’s leadership has domestic pressures and succession issues; Jerusalem has coalition politics and a public that expects decisive action. Each side assumes the other will blink.

F-16I Sufa Fighter. Image Credit: Creative Commons.

A wider war here would move fast. Hezbollah fires massed rockets; Israel hits air defenses, air bases, and nuclear-related sites; Iran launches ballistic salvos and stirs the Houthis to attack shipping; U.S. forces defending bases and sea lanes get drawn in.

The commute from limited strikes to theater war is short: air refueling tracks get contested, long-range air defenses engage aircraft and standoff weapons, and misidentified radar returns become “proof” of intent. Worse, the conflict sits astride the world’s energy routes.

A week of disrupted traffic in the Red Sea and Gulf ripples into prices, politics, and public patience. The incentive to hit back—hard and publicly—grows.

The Korean Peninsula: A War That Doesn’t Need An Invitation

The Korean Peninsula is the least changed and most combustible front in the world. And, to be frank, the one I have done the most work on over the decades.

North Korea has missiles of every range, artillery dug into mountains, and a leadership obsessed with regime survival. South Korea has modern airpower, missile defenses, and—more than ever—the will to retaliate.

The United States and Japan have tightened cooperation with Seoul; Pyongyang has found new friends and munitions. Everyone is more capable, more alert, and more convinced of their own deterrent logic.

Russian President Vladimir Putin (R) meets with North Korea’s leader Kim Jong Un in Vladivostok, Russia April 25, 2019.

The spark could be small: a fatal exchange along the Northern Limit Line at sea, a missile test that overshoots, a drone strike that hits a symbolic target in Seoul, or a North Korean attempt to throw its weight around during a U.S. or South Korean election. The problem is that both sides keep score in public now. Seoul can’t shrug off casualties; Pyongyang can’t admit weakness.

A one-night artillery barrage answered by precision strikes on launchers and command nodes is stabilizing only if both sides agree to stop—a generous assumption when domestic audiences are watching. Add nuclear signaling and you have a crisis that can leap rungs on the escalation ladder in hours.

The India–China Himalayas: A High-Altitude Fuse Between Nuclear Powers

Far from the sea lanes and cable news maps, the Himalayas are a quiet place where world wars start. India and China are nuclear powers with fast-modernizing militaries and a border that is both disputed and poorly demarcated.

Troops face each other on ridgelines at oxygen-starved altitudes; skirmishes have already turned deadly, and both sides have built roads, airfields, and logistics hubs that reduce warning time. The region is a geometry problem from hell: one narrow valley or new road can shift tactical advantage, tempting each side to push “just a little.”

A crisis here would look different—but be no less dangerous. It starts with a patrol clash and turns into rocket and artillery duels, then spirals as air defenses and fighters join. Both sides would try to keep strikes inside the theater and below the nuclear threshold; both would also move reinforcements and mobilize public opinion.

DF-100 Missiles: X Screengrab.

The risk is that air combat over mountains, with stressed crews and contested communications, generates an incident—downed aircraft, missing pilots—that becomes a national cause. Outside powers would scramble to mediate, but missteps could pull the United States and Russia, as partners and suppliers, into the political slipstream.

Why These Flashpoints Are Worse In 2025 Than A Decade Ago

The map hasn’t changed much in ten years; everything else has. First, speed: drones, long-range missiles, and hypersonic-class weapons compress decision time. Leaders now manage minutes, not days. Second, sensors everywhere: commercial satellites, open-source sleuthing, and ubiquitous ISR make it hard to hide preparations—so every move is read as a signal, and sometimes misread as a threat. Third, gray-zone tactics: coast guards, militias, cyber units, and proxies provide options for salami-slicing that still put real people in real danger.

A U.S. Air Force B-1B Lancer, assigned to the 37th Expeditionary Bomb Squadron, Ellsworth Air Force Base, S.D., flies over the East China Sea, Jan. 9, 2018. The Lancer serves as premier platform for America’s long-range bomber force, carrying the largest conventional payload of guided and unguided weapons in the Air Force inventory. (U.S. Air Force photo by Staff Sgt. Peter Reft)

Most of all, mutual deterrence is fragmenting. States are increasingly confident that they can control escalation through tailored strikes, deniable actors, or clever timing. The history of crises says otherwise. When political narratives harden and militaries operate in tight spaces, a single unlucky event—collision, misfire, misidentification—becomes the proof each side needs to do what it wanted to do anyway. That’s how “local” fights go global.

What Would Actually Prevent A Global War

Deterrence without communication is a dare. Each of these theaters needs both.

Hard Power That Matters. In the Indo-Pacific, that means survivable magazines: submarines, land-based anti-ship missiles, and bombers that can sprint from depth to effect. In Europe, it means layered air defenses and long-range fires in numbers that make salvos uneconomical. In the Middle East, it means integrated air and missile defense that turns terror weapons into political duds. On the peninsula and in the Himalayas, it means ready forces with logistics for sustained operations, not just a photo-op mobilization.

Type 093B Submarine from China. Image Credit: Screengrab.

Crisis Channels That Work Under Stress. Hotlines matter only if they’re staffed by people empowered to say “stop” in the moment. Military-to-military deconfliction for air and maritime encounters, rules of the road for unmanned systems, and pre-agreed protocols for recovering downed aircrew sound boring—until they save a week.

Clarity About Red Lines—And The Off-Ramps. Ambiguity can deter; it can also invite tests. The United States and its allies should state plainly what triggers response and what a de-escalation path looks like. The same goes for adversaries: we should listen when they tell us what they can’t tolerate, not because we must concede it, but because misreading the other side’s sacred spaces is how wars begin.

Economic Resilience. Energy and supply-chain shock absorbers won’t stop missiles, but they will buy political time for measured responses. If a week of disruption means panic at the pump, leaders will reach for the most dramatic options first.

Conclusion: The Firebreaks Are Political—Build Them Now to Avoid World War III

It’s fashionable to say World War III is “already here” in the form of cyberattacks, disinformation, and proxy wars. That collapses important distinctions. The world we actually fear is one where state-on-state, great-power combat breaks out and spreads.

A F-16 Fighting Falcon assigned to the 35th Fighter Wing takes off at Yokota Air Base, Japan, May 21, 2022 during the Japanese-American Friendship Festival. Due to COVID-19 pandemic, this year festival marks the first time Yokota has held the annual event since 2019. (U.S. Air Force photo by Yasuo Osakabe)

The good news in 2025 is that this is not inevitable; the bad news is that we are closer to it than we admit.

The five flashpoints above are not destiny—they are tests. If we posture forces credibly, speak clearly, and keep channels open for when someone does something stupid, we can pass them. If we improvise our way through each crisis and hope the other side blinks, we may learn the hard way that history still has room for catastrophes of our own making.

The time to build firebreaks is before the fire starts. That means magazines full, red lines clear, and phones answered on the first ring—because in 2025, the difference between a scare and a war may be measured in minutes.

About the Author: Harry J. Kazianis 

Harry J. Kazianis (@Grecianformula) is Editor-In-Chief and President of National Security Journal. He was the former Senior Director of National Security Affairs at the Center for the National Interest (CFTNI), a foreign policy think tank founded by Richard Nixon based in Washington, DC. Harry has over a decade of experience in think tanks and national security publishing. His ideas have been published in the NY Times, The Washington Post, The Wall Street Journal, CNN, and many other outlets worldwide. He has held positions at CSIS, the Heritage Foundation, the University of Nottingham, and several other institutions related to national security research and studies. He is the former Executive Editor of the National Interest and the Diplomat. He holds a Master’s degree focusing on international affairs from Harvard University.

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