We study how disruptions to the supply of foreign critical inputs (FCIs) might affect value added at different levels of aggregation. FCIs are inputs primarily sourced from extra-EU countries with highly concentrated supply, or consisting in advanced technology products, or which are key to the green transition. Using firm-level customs and balance sheet data for Belgium, Spain, France, Italy and Slovenia, our framework allows us to assess how much – and how differently – geoeconomic fragmentation might affect European economies.