Estonia declines to detain Russia’s shadow fleet in Baltic Sea

Estonia will avoid detaining Russian “shadow fleet” oil tankers in the Baltic Sea, citing the high risk of military escalation with Moscow, according to a senior naval commander.

The stance highlights growing tensions over Western enforcement of sanctions on Russian energy exports and the security dynamics in NATO’s north-eastern flank, Caliber.Az reports via foreign media.

The decision contrasts with actions by some other European states, including the United Kingdom, France, Belgium and Sweden, which have stepped up efforts to intercept or detain ageing tankers suspected of helping Russia circumvent sanctions linked to the war in Ukraine.

However, Estonia says its geographical proximity to Russia’s key export routes in the Gulf of Finland makes such operations significantly more dangerous.

Estonian Navy Commander Ivo Värk told Reuters that Tallinn’s earlier attempt to board a suspect tanker in 2025 triggered a strong Russian response, including the deployment of a fighter jet into NATO airspace. Since then, Estonia assesses that Moscow has increased its naval presence in the region, deploying armed vessels to escort commercial shipping linked to its oil exports.

The situation is particularly sensitive around the Gulf of Finland, where Russian naval units now reportedly patrol alongside commercial tankers bound for Russian ports. Estonia says it will only consider intervention in extreme cases, such as imminent environmental threats or damage to critical underwater infrastructure.

Reporting from the Vaindloo Anchorage, Reuters observed a build-up of idle tankers waiting to load oil, a backlog partly attributed to Ukrainian drone strikes disrupting Russian port operations. Estonian officials estimate the number of vessels in the anchorage has recently risen sharply.

The Kremlin maintains that its vessels have the right of free passage in the Baltic and warns it will respond to any attempt to obstruct them, framing Western sanctions as illegitimate economic pressure.

The episode underscores a broader dilemma for NATO: balancing enforcement of sanctions and maritime security measures against the risk of direct confrontation with Russia, particularly in heavily militarised waters close to Russian territory. Estonia’s restrained posture reflects a prioritisation of de-escalation over aggressive interdiction in one of Europe’s most sensitive maritime corridors.

By Aghakazim Guliyev