From 2022 through early 2025, there has been a series of suspected covert Russian operations targeting Europe's critical underwater infrastructure, especially in the Baltic Sea region. Notably, on 7 October 2023, a Chinese-registered vessel cut two undersea telecommunications cables connecting Estonia to Finland and Sweden and damaged a gas pipeline between Finland and Estonia. Subsequently, four similar maritime incidents occurred near Gotland island (Sweden), affecting telecom, power, and gas lines linking Nordic countries, the Baltic states, and Germany. Despite Russia's denial, the incidents are suspected to be part of a deniable and covert campaign aligned with Russia's hybrid warfare doctrine targeting NATO allies to undermine support for Ukraine and probe alliance defenses along the newly extended NATO eastern flank, especially after the accession of Finland and Sweden to NATO in 2023-2024. The sabotage underscores significant vulnerability in Europe's critical energy and communication infrastructure. Ongoing investigations have yet to conclusively prove ill intent, although some implicated vessels belong to Russia's shadow fleet, used to circumvent sanctions. The European response has included heightened naval patrols and establishment of dedicated units to secure undersea infrastructure, while legal and enforcement actions face challenges due to international maritime laws prioritizing free navigation. These activities portend increased risk amid escalating Russian-Western tensions and rising military activity in the Baltic Sea.

From 2022 through early 2025, there has been a series of suspected covert Russian operations targeting Europe's critical underwater infrastructure, especially in the Baltic Sea region. Notably, on 7 October 2023, a Chinese-registered vessel cut two undersea telecommunications cables connecting Estonia to Finland and Sweden and damaged a gas pipeline between Finland and Estonia. Subsequently, four similar maritime incidents occurred near Gotland island (Sweden), affecting telecom, power, and gas lines linking Nordic countries, the Baltic states, and Germany. Despite Russia's denial, the incidents are suspected to be part of a deniable and covert campaign aligned with Russia's hybrid warfare doctrine targeting NATO allies to undermine support for Ukraine and probe alliance defenses along the newly extended NATO eastern flank, especially after the accession of Finland and Sweden to NATO in 2023-2024. The sabotage underscores significant vulnerability in Europe's critical energy and communication infrastructure. Ongoing investigations have yet to conclusively prove ill intent, although some implicated vessels belong to Russia's shadow fleet, used to circumvent sanctions. The European response has included heightened naval patrols and establishment of dedicated units to secure undersea infrastructure, while legal and enforcement actions face challenges due to international maritime laws prioritizing free navigation. These activities portend increased risk amid escalating Russian-Western tensions and rising military activity in the Baltic Sea.