Geopolitics & War Brief — June 25, 2026

The Big Story

America's most advanced nuclear deterrent has a fatal supply-chain weakness: China controls the rare earth minerals that make it work. The Columbia-class ballistic missile submarine—twelve of which will replace the aging Ohio-class fleet starting in the 2030s—relies almost entirely on rare earths refined in China for its core capabilities ^[1]. Each boat carries 16 Trident II missiles and is powered by a permanent magnet motor so acoustically quiet it's virtually undetectable by adversaries. That stealth, that precision strike capability, that entire edge in underwater warfare depends on materials sourced from a strategic competitor ^[1].

This isn't a hypothetical risk. The dependency "runs through every layer of the capability stack," meaning it touches propulsion, stealth, and targeting systems ^[1]. For a submarine class that will define American nuclear strategy for three decades, this is perhaps the Navy's most consequential and least discussed vulnerability. The Columbia-class won't reach full deployment until the 2040s—years from now—but the supply-chain problem exists right now, and there's no public indication of a domestic alternative being developed.

For an everyday investor or policy observer, this matters because it exposes a hard truth: military superiority can't be divorced from economic leverage. If China controls the rare earths, it controls leverage over America's deterrent, no matter how many submarines you build.

What Else Moved

Congress Halts Trump's Iran War

The Senate voted to end military operations in Iran, marking the first time both chambers of Congress have voted to terminate the conflict ^[7]. This is a rare rebuke: House and Senate agreement on ending a war is historically difficult to achieve. The timing matters—it suggests growing Congressional appetite to constrain executive power over military deployments, particularly in the Middle East. For investors tracking defense spending, Congressional war powers votes are leading indicators of budget direction and contractor demand.

Pentagon Races to Protect Secrets from Quantum Computing

The Department of Defense released a quantum strategy alongside two executive orders, setting deadlines for agencies to adopt post-quantum cryptography ^[2]. The rush reflects a real threat: quantum computers could theoretically break the encryption protecting military secrets, weapons designs, and communications. The strategy is described as "a first step," suggesting the Pentagon knows this is urgent but incomplete ^[2]. The Five Eyes intelligence alliance—the U.S., UK, Canada, Australia, and New Zealand—is warning that frontier AI could also accelerate both cyberattacks and cyber defenses ^[8]. The NSA has already lost access to some intelligence capabilities after the White House imposed limits on its use of frontier AI systems ^[8]. This is the rare case where government is restricting its own access to a capability because the security risk is deemed too high.

AI Integration Into Nuclear Command Faces Scrutiny

War on the Rocks revisited a 2024 analysis on integrating artificial intelligence into the nuclear chain of command, which identified both opportunities and risks ^[4]. As AI becomes increasingly embedded in military systems, the core question persists: Can you automate decisions in nuclear weapons handling without creating new failure modes? The Department of Defense is grappling with whether nuclear AI is a priority or a back-seat issue ^[4]. This is perhaps the highest-stakes AI governance question in the world—a mistake in implementation could destabilize mutually assured destruction (the decades-old assumption that nuclear powers won't attack each other because retaliation would be equally catastrophic).

Drone Operators Get New Tools

General Atomics is upgrading ground control stations to enable current drone operators to fly the newer MQ-9B unmanned aircraft ^[3]. This allows existing personnel to operate advanced systems without retraining, reducing downtime and costs. While less dramatic than nuclear strategy, drone proliferation and modernization signal continued U.S. investment in persistent aerial surveillance and strike capability—especially relevant given ongoing operations across the Middle East and Africa.

Space Force Braces for All-Out Warfare

A Mitchell Institute report warns the Space Force must prepare for full-scale warfare scenarios ^[6]. Satellites are critical to modern military operations—GPS, communications, intelligence gathering—and they're vulnerable to attack. The think tank's analysis suggests the Pentagon is reconsidering assumptions about space as a contested domain rather than a sanctuary.

Ethics Questions Loom Over Defense Contractor Nominees

Senator Warren requested an ethics pledge from Raytheon executive Erich Hernandez-Baquero, nominated to a top space acquisition role, citing impartiality concerns ^[5]. This reflects ongoing tension between industry and government: defense contractors employ former Pentagon officials, and vice versa. The ethics challenge signals Congress may be tightening scrutiny over conflicts of interest in defense procurement.

Connecting the Dots

Three vulnerability threads are visible in today's stories: supply-chain (rare earths), technological (quantum and AI), and political (Congressional pushback). They're independent problems, but they share a common pattern: American military dominance assumes stable, favorable conditions that no longer exist. China controls the materials for next-gen submarines. Quantum computing threatens encryption that protects military secrets. AI is advancing faster than governance frameworks can manage. Congress is reasserting power over war decisions. None of these individually dismantles U.S. military superiority, but together they suggest the Pentagon is operating in an era of constrained advantages—fewer supply-chain certainties, more adversarial AI, less unilateral decision-making authority. The Columbia-class submarines won't enter service for years, but the vulnerabilities they'll face are already here.

What to Watch

Watch for: (1) Congressional action on rare earth supply chains and whether a domestic refining capacity initiative emerges ^[1]; (2) Pentagon timelines for post-quantum cryptography adoption—slipped deadlines signal technical difficulty ^[2]; (3) DoD decisions on nuclear AI integration and whether formal doctrine changes appear ^[4]; (4) Space Force budget allocations and whether congressional appropriations reflect the Mitchell Institute's war scenario warnings ^[6]. Each represents a decision point on whether America will address these vulnerabilities proactively or reactively.