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.

After Western powers imposed sanctions on Russian oil, they've accused Moscow of secretly operating tankers to circumvent the bans. Now, the EU is raising tensions as it seeks to stop the ships operating in the Baltic.

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,