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,

The detention followed recent moves by Estonia and its neighbors to clamp down on Russia's so-called "shadow fleet," which is used to bypass Western oil sanctions.

Russia detained the Liberian-flagged oil tanker Green Admire, which left the port of Sillamae and was sailing through Russian territorial waters, Estonian Public Broadcasting said Sunday, citing the Estonian Department of Transport.