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THRESHOLD BriefsUnchangedPolandBaltic securityDeterrence

Suwałki Gap: why Poland is part of any Baltic scenario

Geography does not make war inevitable, but it makes Baltic security impossible to analyse without Poland.

Published: 2026-09-12Updated: 2026-09-129 min readConfidence: High

Geography as commitment

The gap is not an isolated point on a map but part of a system of links, air defence, surveillance and reinforcement reception.

That is why any Baltic crisis almost immediately becomes a question of Polish readiness and NATO-wide credibility.

Analytical framework

Facts

Poland provides the land connection to Lithuania. Kaliningrad and Belarus create two pressure directions.

Assessment

The main risk need not take the form of a classic assault; pressure can test mobility, decision-making and alliance cohesion.

Uncertainties

Actual crisis throughput and readiness are partly classified.

What would change this assessment

Correlated deployments on both sides of the gap with movement interdiction and strong air cover.

How a crisis could develop

T+0

Disruption

Cyber, EW and border pressure.

T+24h

Mobility test

Movement disruption and ambiguous incidents.

T+48h

Alliance dilemma

Reinforcement decision under time pressure.

Sources and notes

Publisher names and original titles remain in their canonical form.

  1. [1]NATONATO’s deterrence and defence posture2026-09-17
  2. [2]OSWOśrodek Studiów Wschodnich — Analizy2026-09-17
  3. [3]ReutersEurope security coverage2026-09-17

Version history / assessment changes

2026-09-12
Unchanged

Initial publication; assessment unchanged.