France has fined a Russia-linked oil tanker several million euros after detaining it for violating EU sanctions, marking one of the clearest physical enforcement actions yet against Moscow’s shadow fleet. The tanker, Grinch, was boarded in the Mediterranean last month after sailing from Murmansk in Russia’s Arctic. It was held for three weeks at Fos-sur-Mer before being cleared to leave French waters, according to French Foreign Minister Jean-Noel Barrot. The exact fine was not disclosed. The vessel is part of the network of tankers…