Russia has released a Greek-owned oil tanker which was detained in Russian waters on Sunday after leaving an Estonian port, and the vessel has resumed its journey towards the Dutch port of Rotterdam,

MILAN — Russia’s detention of a Greek-owned ship that departed from Estonia – days after Estonian forces tried to intercept a Russia-bound tanker – signals Moscow’s willingness to deploy military power more overtly to protect its shadow-fleet, a vital pillar of its war economy, experts say.

On May 13, a mysterious ship named Jaguar sailed through waters near Estonia in the Baltic Sea. This ship, once registered under Gabon’s flag but now sailing without any national flag, was believed to be part of a “shadow fleet.