A new book warns that China, Russia, Iran and North Korea have formed a de facto strategic bloc despite lacking a formal mutual‑defense treaty, creating the potential for simultaneous crises that could challenge the United States.
The analysis documents extensive cooperation across military, economic, cyber and technology domains, noting that while there is no unified command or complete trust among the four, practical effects are already evident in ongoing conflicts.
In the war in Ukraine, the four states have supplied ammunition, drones, troops and advanced technology, with China providing economic support and microelectronics for ballistic, cruise and hypersonic missiles.
Researchers recorded 616 instances of security cooperation between 2019 and 2025, encompassing arms transfers, joint exercises, intelligence sharing and military exchanges.
The authors highlight a “simultaneity problem”: the United States may have to confront multiple coordinated threats at once, a challenge that exceeds the capacity to handle isolated crises.
Potential flashpoints include a China‑Taiwan confrontation where North Korea could threaten South Korea, and a Russia‑NATO clash in the Baltic that might be accompanied by Iranian terrorist actions.
The most consequential bilateral link is China‑Russia cooperation; Chinese dual‑use goods sustain Russia’s defense industrial base, while Russia shares technology and battlefield lessons that could aid China in a Pacific conflict.
North Korea has delivered artillery, missiles and personnel to Russia, receiving Russian assistance for its missile, space, drone and nuclear programs in return.
Iran contributes drones and production expertise to Russia, and both Russian and Chinese support could help Tehran rebuild capabilities diminished by conflicts with Israel and the United States.
Economic interdependence underpins the military ties: China purchases large volumes of Russian and Iranian energy while providing technology and market access, creating a fractured alignment driven by necessity.
China reportedly buys up to 95 % of Iran’s oil, often routing sanctioned shipments through third parties and processing them in Chinese refineries, thereby sustaining the export flow.
The trio is developing alternative payment mechanisms, increasingly settling trade in yuan through a cross‑border system, which could erode U.S. sanctions leverage.
Cyber operations blur the line between state actors and criminal groups, with shared infrastructure among Iranian, Russian, Chinese and North Korean hackers facilitating coordinated attacks.
Drone warfare exemplifies the supply chain: Chinese components are incorporated into Iranian drones that are then used by Russian forces, extending the threat to civilian populations and U.S. service members.
Recent attacks on U.S. personnel illustrate the real‑world danger of this cooperation, with Iranian drones and Russian tactics combined in lethal operations abroad.
Military modernization across air, sea, land, space and cyber domains is accelerating among the four states, and their growing synchronization intensifies the strategic challenge for the United States.
Analysts argue that current U.S. language understates the severity, noting that the bloc seeks to diminish and defeat American power rather than merely compete.
Recommendations include deeper coordination with allies, expanded defense production, enhanced protection of critical infrastructure, and more aggressive enforcement of sanctions targeting the full network supporting illicit oil trade.
Treating the four nations as a combined threat is essential to address the multiple crises they are poised to generate.
