On 16 March 2022, following a request by Ukrenergo and Moldelectrica (the electricity transmission system operators in Ukraine and Moldova) for emergency synchronisation, ENTSO-E (the European Network of Transmission System Operators for Electricity) began the trial synchronisation of the Continental European Power System with the power systems of Ukraine and Moldova. This article is a repost, originally published by the European University Institute (EUI) on 17th of March 2022.