<h1>U.S. official warns sanctions on intermediaries reselling Russian oil could raise global prices, urges constructive European cooperation</h1> A senior U.S. official said oil exported from Russia to China is refined there and resold into the global market, with some flows reaching Europe, which continues to purchase Russian energy. The official warned that enforcing secondary sanctions or sweeping tariffs aimed at intermediaries could raise global prices or force buyers to seek alternatives, and observed European concern about proposed punitive measures targeting buyers. The official urged European partners to do more on sanctions while avoiding a retaliatory approach, framing cooperation as constructive to reduce reliance on Russian hydrocarbons.