The three Baltic states disconnected their electricity systems from Russia's power grid on Saturday, the region's operators said, part of a plan designed to integrate the countries more closely with the European Union and boost security.

Estonia, Latvia and Lithuania disconnected from the IPS/UPS joint network and, subject to last-minute tests, they will synchronize with the EU's grid on Sunday after operating on their own in the meantime.

European Commission President Ursula von der Leyen will speak at a ceremony on Sunday to mark the switch to the EU system, her office said on Friday.