Although the world watched for months as Russian troops amassed on the Ukrainian border, there was still a collective disbelief at Russia’s audacious invasion of its sovereign neighbour. On 24 February, as Russian tanks went in, Ukrainian refugees flowed out. In response, the European Union united in a way never seen before to implement sanctions against Russia, send weapons to Ukraine and accommodate the displaced. As the war continues with no feasible solution in sight, economists and policymakers are considering the ripple effects of the conflict in numerous sectors: energy, food and agriculture, raw materials and technology, security and defence, migration, and the global world order. This Forum examines the impact of the war on the European economy and society, how to address the fall out in the hardest hit sectors and the deep-seated ramifications that will play out in the years and decades to come.