The Baltic states of Lithuania, Latvia, and Estonia are bracing themselves for possible retaliation as they decouple from Russia's power grid this weekend.

Nearly three and a half decades after leaving the Soviet Union, the three Baltic nations are permanently disconnecting from Russia’s power grid. They have stopped buying natural gas from Russia, but their electricity grids are still connected to those of Russia and Belarus amid the ongoing war between Ukraine and Russia.

After years of preparation, Lithuania, Estonia and Latvia will disconnect from their Russian-controlled electricity grid this weekend, erasing one of the last traces of their Soviet past. CNN’s Clare Sebastian explains the security concerns,