Russia’s invasion of Ukraine marked the beginning of the world’s first truly global strategic conflict since 1945, and the U.S. confrontation with Iran, watched closely by China, now threatens to fuse those overlapping rivalries into the broadest international war of the modern era.
The trigger is that modern high-intensity warfare consumes key weapons far faster than the United States and Europe can manufacture replacements. The most acute bottlenecks are sophisticated systems: Patriot interceptors and other air-defense missiles, long-range precision weapons, and some naval air-defense missiles. The Ukraine and Iran theaters literally compete for some of the same finite inventories.
A Patriot interceptor fired at an Iranian missile cannot defend Kyiv. An American destroyer sent to the Gulf cannot simultaneously deter China in the Pacific. Every commitment creates an opportunity somewhere else. The danger is not that Moscow, Beijing, Tehran, and Pyongyang will suddenly declare war together, but that separate conflicts affect each other to such a degree that they come to be seen as one.
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In the Ukraine arena, while fighting has remained concentrated locally, the conflict has drawn in China, Iran, and North Korea, each supporting Moscow according to its own interests. Iran supplied the drones that terrorized Ukrainian cities and infrastructure. North Korea delivered artillery ammunition, ballistic missiles, and eventually troops. China sustained Russia’s war economy through dual-use technologies, electronics, financial support, and diplomatic protection. Ukraine became the arena in which the world’s leading democratic and authoritarian powers test one another’s strength.
After more than four years, neither Russia nor Ukraine appears capable of achieving a decisive military victory, yet neither believes it can afford a negotiated settlement on acceptable terms. As battlefield maneuver became increasingly costly and difficult, the conflict evolved into a contest of industrial capacity, technological innovation, logistics, and national endurance. Russia continues expanding military production despite staggering casualties and economic pressure. Ukraine, despite far fewer resources, has repeatedly compensated through ingenuity and adaptation. Largely using unmanned systems, it has stabilized the front lines, imposed serious damage on Russian military logistics, and struck strategic targets deep inside Russia.
Ukraine has transformed modern warfare. Long-range yet cheap drones now strike hundreds of miles inside Russia, destroying oil infrastructure, military airfields, ammunition depots, logistics hubs, and defense factories once considered safely beyond Kyiv’s reach.
Interestingly, Russia’s immense geography, historically among its greatest strategic advantages, has become a liability because no air-defense system can protect every refinery, every rail junction, every air base, and every factory simultaneously in so vast an area. The Kremlin finds itself defending territory once thought untouchable, while Ukraine demonstrates that relatively inexpensive technology can threaten assets worth billions. Military planners globally are revising long-held assumptions about what Thomas Schelling famously called “the power to hurt.”
The outcome will influence whether territorial conquest again becomes an accepted instrument of international politics, whether NATO’s security guarantees retain their credibility, and whether authoritarian powers conclude that persistence ultimately overcomes Western resolve. Every government confronting expansionist neighbors is closely watching what has become a test of the post-World War II order.
Outside support has therefore become central to the strategic balance. The air-defense interceptors, precision missiles, intelligence, and industrial capacity underpinning Ukraine’s defense are increasingly in demand in the Persian Gulf, where the confrontation with Iran consumes many of the same weapons and resources. Every Patriot interceptor launched over the Gulf and every additional naval or logistical commitment reduces the flexibility available in Europe. Industrial production that already struggled to sustain one major war now faces the demands of two.
That changing balance offers Moscow an opportunity. Russian President Vladimir Putin has consistently pursued a strategy of attrition and exhaustion founded upon the expectation that Russia can sustain prolonged conflict more successfully than democratic coalitions with finite political attention and limited military inventories.
As Western resources become increasingly scarce and divided, Russia has intensified missile attacks against Ukrainian cities and expanded pressure across the front, especially against Ukraine’s “fortress belt” in the Donbas. Moscow is simultaneously supplementing its own production with North Korean weapons, including ballistic missiles.
Missile defense has consequently become Kyiv’s critical vulnerability. Ukraine is desperately short of Patriot interceptors, while the U.S. has expended an estimated two-thirds of its inventory in the war with Iran. The Kremlin knows it may have a limited window before Ukraine and its Western partners field cheaper missile-defense systems in far greater numbers.
Ukraine will remain capable of imposing severe costs through deep strikes into Russia, yet its vulnerability to Russian missiles means growing civilian casualties and infrastructure damage.
European governments would consequently confront a strategic dilemma unlike any since the Cold War. A successful Russian offensive would reshape the continent’s security architecture and expose NATO’s eastern frontier to sustained military pressure. Continued deliveries of equipment might gradually give way to deployments of additional air-defense units, engineers, logistics formations, intelligence personnel, and other military assets operating inside Ukraine. Each decision could appear limited and defensive in isolation while collectively bringing Europe into progressively closer confrontation with Russia.
Meanwhile, the confrontation with Iran acquires strategic importance extending far beyond the Middle East. Continued threats to shipping through the Strait of Hormuz and the Red Sea keep global energy markets under pressure while demanding an expanding American military commitment. Iraq again assumes enormous importance as the principal logistical platform for operations against Iran. Additional naval deployments, missile-defense systems, intelligence assets, and long-range strike capabilities flow into the region. The Gulf thereby absorbs military resources that also shape the balance of power in Europe and, increasingly, the Indo-Pacific.
Beijing observes these developments through the prism of Taiwan. American forces are increasingly committed in the Middle East, European resources are consumed by Ukraine, and Western missile inventories are being depleted faster than industry can replenish them. Chinese leaders could reasonably conclude that prolonged pressure around Taiwan through maritime coercion, blockades, and sustained military demonstrations would impose still greater strain upon Washington and its allies. Russia, China, Iran, and North Korea consequently find their strategic interests converging even without an alliance. Each benefits from stretching Western military capacity across multiple theaters simultaneously.
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In such a situation, it is easy to envision one provocation too many becoming the tripwire.
World War I emerged when a regional crisis triggered obligations and calculations that extended far beyond the Balkans. World War II grew from years of interconnected aggression across Europe and Asia that ultimately merged into a single global conflict. It may be only through hindsight that we understand when the Third World War began. And that date may have already passed.
Colonel (Ret.) Robert Hamilton, a former professor at the U.S. Army War College, is president of the Delphi Global Research Center and heads Eurasia Research at the Foreign Policy Research Institute. Dan Perry is a former chief editor of the Associated Press in Europe, Africa, and the Middle East, former chairman of the Foreign Press Association in Jerusalem, and publisher of Ask Questions Later at danperry, substack.com.