Self-undermining arsenal

Self-undermining arsenal is the hypothesis that repeated use of a state's economic leverage can encourage adaptation that weakens the networks supporting that leverage. It is not a demonstrated law, and target adaptation can coexist with substantial short-term coercive effect.

Proposed mechanism

A sender exploits centrality in finance, trade, technology or logistics. Targets and third parties then diversify reserves, suppliers, payment routes, shipping or legal exposure. If alternatives reach sufficient scale and reliability, future leverage may decline.

Network reconstitution (parallel rails) describes construction of substitute infrastructure. SPFS is one alternative messaging network, while Shadow fleet arrangements concern shipping and services. Neither automatically replaces the liquidity, coverage or trust of the original network.

Russian reserve diversification and payments adaptation (2014-2022) illustrates deliberate adjustment before the 2022 reserve immobilisation. A case can support a mechanism without proving aggregate displacement across the monetary system.

Measurement

IMF COFER's revised dataset reported the US dollar at 57.13 per cent of allocated reserves for 2026Q1. Reserve share is not trade invoicing, payment messaging, cross-border lending or foreign-exchange turnover. Dataset revisions, valuation and reserve-manager preferences must be separated from sanctions effects.

BIS payment and monetary-system analysis covers other dimensions. A rise in a regional rail can occur alongside continued use of the incumbent network. Transaction count, value, currency, participants and geographic coverage are different denominators.

Scope conditions and alternatives

Adaptation is more likely when restrictions are expected to persist, substitutes are technically feasible and several users coordinate. It is weaker where network effects, legal trust, deep markets and complementary services remain concentrated.

Alternative explanations include macroeconomic change, exchange rates, trade composition, regulatory reform and long-running diversification. A before-and-after change following sanctions does not establish causation.

Strategic assessment

The US Treasury's 2021 review warned that poor design, weak coordination and unnecessary costs can reduce sanctions efficacy. That is a policy judgement supporting calibration, not proof that use always destroys leverage.

Test design

A credible test needs an exposure measure before the restriction, a dated adaptation decision and an outcome that can be compared with a plausible alternative path. Announcements of new rails or reserve targets are inputs, not evidence of durable adoption. Researchers should track operational volume, pricing, reliability, membership, convertibility and continued dependence on incumbent institutions.

Sender leverage has several components. It may rest on market depth, legal jurisdiction, technology ownership, data access, alliance coverage or firms' preference for a trusted standard. Adaptation can reduce one component while leaving others intact. It can also impose a continuing tax on the target through higher collateral, slower settlement or inferior technology.

The relevant counterfactual is not a world without diversification. Reserve managers and firms diversify for ordinary prudential and commercial reasons. Evidence is stronger where documents, budgets or official statements connect a specific restriction to the timing and design of substitution. Editors should report both the target's adjustment and the sender's capacity to extend, coordinate or recalibrate the measure.

Editors should specify the weapon, network, adaptation channel, metric, baseline, time horizon and counterfactual. The hypothesis is strongest when dated evidence connects restriction to investment, adoption and measurable loss of sender control. It is weakened where alternatives remain small, dependent on the original system or used only for sanctioned trade.

Sources

1. International Monetary Fund, 2026Q1 COFER data brief.
2. International Monetary Fund, COFER dataset (accessed 30 July 2026).
3. US Treasury, 2021 sanctions review.
4. Bank for International Settlements, 2025 monetary-system chapter.