Having kept mum about the fleet details of its US-sanctioned subsidiary, Cosco Shipping Tanker (Dalian) Co, the world’s largest oil tanker owner has become increasingly isolated from international shipping.

While Cosco Shipping Energy Transportation (CSET), part of Chinese state conglomerate China Cosco Shipping, can rely on group affiliates for crew, technical management and bunker suppliers, many charterers and brokers are hesitant in continuing their business relationships with CSET since Washington put Cosco Dalian on the sanctions list late Wednesday.