United Nations aid chief Martin Griffiths warned the collapse of the massive Nova Kakhovka dam in Ukraine’s Russian-occupied Kherson region “will have grave and far-reaching consequences“. Ukraine and Russia blame each other for the collapse, and Putin has called the dam collapse an “environmental and humanitarian catastrophe”. The collapse has so far caused widespread flooding and forced around 42,000 people to evacuate. Experts say there is no immediate threat to the Zaporizhzhia nuclear plant, which is Europe’s largest and relies on the water supply regulated by the dam – but there are doubts longer-term. It will likely take weeks to determine the full impact of the catastrophe, but experts warn of widespread issues, including upending communities that rely on the reservoir for drinking water and agriculture. There’s also an issue with polluted floodwater washing into the Black Sea, which could impact the nearby countries of Romania, Georgia, Turkey and Bulgaria. A gallery of pics of the disaster shows the damage.