16 October 2026

Russia’s Hybrid War Has Entered a Dangerous New Phase

Foreign Affairs | Julianne Smith

Russia executes escalating hybrid warfare operations across Europe, encompassing severed undersea cables, concealed incendiary packages, and coordinated arson attacks on military depots. NATO allies respond with reinforced critical infrastructure, expanded Baltic Sea patrols, and heightened intelligence sharing. These defensive measures remain largely reactive, constrained by the small scale and plausible deniability of Moscow's persistent sabotage campaign.

Western capitals struggle to establish effective deterrence against sub-threshold aggression that deliberately avoids triggering a direct collective military response. The alliance faces an expanding security challenge as hostile grey-zone tactics intensify across member territories. Continued reluctance to impose severe costs risks normalizing sub-conventional warfare as a permanent instrument of coercion.

Comment

Sub-threshold sabotage operations conducted against European rail depots and undersea cables exploit the seams between peacetime law enforcement and Article 5 thresholds. NATO's reliance on increased Baltic Sea patrols and infrastructure hardening addresses tactical vulnerabilities without imposing systemic costs on Moscow's intelligence services. Consequently, the operational tempo of proxy operatives remains unhindered by conventional deterrence postures designed for major theater warfare.

Strategic Question for Discussion
What happens to NATO's collective defense credibility if sub-threshold sabotage in the Baltic Sea continues to bypass Article 5 thresholds indefinitely?
The pattern suggests that chronic sub-threshold attrition gradually erodes alliance cohesion by forcing individual member states to manage attribution and remediation independently. This operational friction points toward a future where regional deterrence fails precisely at the boundary between conventional war and peacetime policing.
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