As the conflict of Russian aggression in Eastern Europe enters its fourth year, we devote a week to a multi-themed assessment: Western military support, the prospect of a long war, strategic uncertainties, the burden of the war effort, and the driving forces behind a phantom mobilisation in Russia. This dossier is fully in line with the IHEDN's mission: to disseminate the knowledge essential for understanding defence issues. You will find a compilation of the articles we have published on this subject over the last three years.