What Is Strategic Deterrence? Global Spending Hit $2.74tn in 2025
Strategic deterrence is the strategy of preventing attack through the credible threat of retaliation, a strategy playing out against $2,740.0bn in world military spending in 2025.
Key takeaways
- Strategic deterrence is the strategy of preventing attack through the credible threat of retaliation, funded in 2025 by a world military spending total of $2,740.0bn across 149 SIPRI-tracked countries.
- Deterrence has nuclear, conventional, and extended forms, which most states combine rather than rely on singly.
- Military spending is a proxy for deterrent capability, not deterrence itself — it signals capacity but not intent or effectiveness.
- The $2,740.0bn figure is our calculation from SIPRI country-level data, not a total SIPRI itself publishes.
- Because some spenders — including North Korea — are absent from SIPRI's dataset, $2,740.0bn is a floor on global spending, not the complete total.
Verdict
Strategic deterrence is the strategy of preventing attack through the credible threat of retaliation, and the 2025 world military spending total of $2,740.0bn across 149 SIPRI-tracked countries is the scale of resources committed to it and related aims. That figure is our calculation from SIPRI country-level data — not SIPRI's own published total — and it is a floor: gaps in coverage, including North Korea's absence from the dataset, mean true global spending is likely higher.
At a glance
| World military spending, 2025 | $2,740.0bnConstant 2024 USD |
|---|---|
| Countries included | 149SIPRI-reported for 2025 |
| Data year | 2025Actual figure, not an estimate |
| Attribution | Our calculationFrom SIPRI country-level data, not SIPRI's own published total |
| Coverage | Floor, not totalNorth Korea and other gapped states excluded |
Strategic deterrence is the strategy of preventing an adversary's attack by credibly threatening unacceptable retaliation — the goal is to make aggression too costly to attempt, not to win a war once it starts. In 2025, the resources states committed to this and related military aims totaled $2,740.0bn worldwide — our sum of the 149 countries SIPRI reports, not a total SIPRI itself publishes — the scale against which any single country's deterrent posture has to be read.
01 What Strategic Deterrence Means
Deterrence works on a simple logic: an actor refrains from attacking because it expects the cost of retaliation to outweigh any gain. "Strategic" deterrence specifically concerns threats to an adversary's homeland or core interests — as opposed to "tactical" deterrence on a battlefield — and it rests on three conditions holding at once: the defender must have a capability to inflict serious harm, the will to use it, and the adversary must believe both are real. Remove any one leg and the deterrent is hollow.
The concept predates nuclear weapons but became central to security policy during the Cold War, when the ability to destroy an opponent's society in retaliation for a first strike reshaped how major powers planned their forces, alliances, and budgets. It remains the organizing idea behind why states — nuclear and non-nuclear alike — maintain standing militaries in peacetime.
02 Nuclear vs. Conventional Deterrence
- Nuclear deterrence — relies on the threat of catastrophic, largely unstoppable retaliation; a small number of states maintain arsenals sized to guarantee a second strike survives a first attack.
- Conventional deterrence — relies on visible, deployable forces (troops, ships, aircraft) whose presence signals that an attack would trigger a costly conventional response, without crossing the nuclear threshold.
- Extended deterrence — a state's promise to retaliate on behalf of an ally, underpinning many alliance structures rather than protecting the guarantor's own territory alone.
These modes overlap in practice. Most states pursuing strategic deterrence combine them: conventional forces handle the day-to-day signaling and lower-level contingencies, while nuclear or allied guarantees sit behind them as the ultimate backstop.
03 How Military Spending Signals Deterrent Capability
Spending is not deterrence itself, but it is the most measurable proxy available for it. Budgets fund the platforms, personnel, and readiness that make a retaliatory threat credible rather than rhetorical — an adversary weighing whether to attack looks at standing capability, not stated intent. That is why aggregate military-expenditure data, even without breaking out which programs are explicitly "deterrent" in purpose, is treated as a rough indicator of a state's or a coalition's deterrent weight.
It is also an imperfect one. Spending totals don't distinguish a nuclear modernization program from routine personnel costs, and two states can spend identical amounts with very different deterrent effect depending on technology, geography, and alliance backing. The figure below should be read as a floor on the resources involved, not a scorecard of deterrent strength.
04 World Military Spending in 2025: $2,740.0bn
SIPRI's country-level data for 2025 — the most recent actual (non-estimate) year in the dataset — sums to a world total of $2,740.0bn in constant 2024 US dollars across the 149 countries it reports.
Our calculation from SIPRI country-level data. Not SIPRI's own published total.
This aggregate is the backdrop against which individual states' deterrent postures — nuclear arsenals, forward-deployed forces, alliance commitments — are funded and compared. See the 2025 world rankings for how that total breaks down by country.
05 Why This Total Is a Floor, Not the Whole World
This is the sum of the 149 countries SIPRI reports for 2025. Some spenders are absent from the dataset — North Korea has no series, and several other states have gaps — so $2,740.0bn is a floor, not a complete picture of global military spending.
Countries missing from SIPRI's coverage are not necessarily minor spenders; some maintain deterrent capabilities, including nuclear ones, without publishing figures SIPRI can verify. That means the true global total for 2025 is at least $2,740.0bn, and likely higher. For definitions of related terms and how they connect to the numbers, see the glossary.
Frequently Asked Questions
- What is strategic deterrence?
- Strategic deterrence is the strategy of preventing an adversary's attack by credibly threatening retaliation severe enough to outweigh any gain from attacking, typically aimed at an adversary's homeland or core interests rather than a battlefield.
- What was world military spending in 2025?
- World military spending totaled $2,740.0bn in constant 2024 US dollars in 2025, summed across the 149 countries SIPRI reports — our calculation from SIPRI country-level data, not a figure SIPRI itself publishes.
- Is the $2,740.0bn total the entire world's military spending?
- No. It is a floor. SIPRI's dataset has gaps — North Korea has no reported series and several other states are missing data — so actual global spending in 2025 is likely higher than $2,740.0bn.
- What's the difference between nuclear and conventional deterrence?
- Nuclear deterrence relies on the threat of catastrophic retaliation using nuclear weapons, while conventional deterrence relies on visible conventional forces signaling a costly non-nuclear response; most states combine both.
defensebudget.org
Defense spending data, sourced from SIPRI
defensebudget.org tracks military expenditure for 160 countries using the SIPRI Military Expenditure Database. Pages are generated from that dataset and reviewed before publication.