Asian shares rose sharply on Wednesday after US stocks posted their best day in nearly a year as hopes grew that the Iran war could de-escalate. South Korea's Kospi jumped 8.1% to 5,461.51 and Tokyo's Nikkei 225 climbed 4.5% to 53,352.96; oil prices rose (Brent $104.66, US crude $102.57) and Nvidia said it would invest $2 billion in Marvell.