macro commentators' proposal to interdict Russia's Baltic shadow fleet at the Danish Straits (Skagen–Gothenburg line) as a Ukraine-peace-talks leverage play. Mechanism: ~half of Russian seaborne oil transits two Baltic ports via shadow-fleet ships; a naval blockade (or de-flagging/Greek-seller sanctions) would restrict supply — an asymmetric CL bull vector layered on Hormuz, though macro commentators argues, per the Iran precedent, it need not spike prices. Bears on CL (supply), 6E/6B (European geopolitical-leverage and naval-fiscal-spend channel).