The so-called Brell power grid - which stands for Belarus, Russia, Estonia, Latvia, Lithuania - is controlled almost entirely by Moscow and has long been seen as a vulnerability for the former Soviet republics, which are now Nato members.

Three Baltic states on Saturday cut ties with Russia's power grid to join the European Union's network, the culmination of a years-long process that gained urgency with Moscow's invasion of Ukraine.

Lithuania, Estonia, and Latvia have disconnected from Russia's power grid, which is a move that leaders say will save them from "geopolitical blackmail."