Europe’s attempt to rid itself of Russian gas has entered a more forensic phase. Having spent the past three years scrambling for alternative supplies, the European Commission is now turning its attention to what it buys, how it is labelled, and whether molecules arriving at the EU’s borders are really what exporters claim them to be. The latest target of this scrutiny is not Moscow directly, but the infrastructure through which gas reaches Europe from Türkiye, including volumes supplied by Azerbaijan.