Ukraine's Zaporizhzhia nuclear power plant (Europe's largest, currently occupied by Russian forces in southern Ukraine) lost all external electricity supply on 14 April for the thirteenth time since the start of the war, raising fresh safety fears just days before the 40th anniversary of the Chernobyl disaster. External power is essential to cool the plant's radioactive fuel, and only two of the original ten transmission lines remain operational — both of which have repeatedly been damaged. Greenpeace Ukraine, citing satellite imagery that contradicted Russian claims of Ukrainian strikes, says the outages are deliberate sabotage by Moscow aimed at forcing Kyiv to allow the plant to be reconnected to the Russian grid, a move the organisation warns could permanently entrench Russian control and risks triggering a serious nuclear accident.