The dollar weakened against all three Northeast Asian currencies today. USD/CNY fell to 6.7058, the yuan up about 0.80% on the day; USD/JPY at 157.30 and USD/KRW at 1358.08 also showed the yen and won firming against the dollar. With three currencies moving the same way, the effect on local-currency trade cost runs one direction.

For refiners and traders buying dollar-priced crude with yuan, a firmer yuan directly lowers the yuan cost of delivered barrels. One barrel of Brent at $99.50 converts to roughly 667 yuan at 6.7058, a cut from the levels above 6.71 a week ago. The easier cost base opens room for downstream cracking and inventory turns.

But transshipment is mostly quoted in dollars, and a weaker dollar means the same cargo's dollar revenue converts to more local currency, good on paper. Yet when renegotiating with buyers, they lean on the soft dollar to press the quote down. So a strong yuan cuts both ways: cheaper to buy in, tighter dollar bargaining room when selling out.