World shares are mixed as Tokyo's Nikkei 225 follows Wall Street to an all-time high

European shares opened lower after a mixed day of trading in Asia, where Japan’s Nikkei 225 index topped 68,000 for the first time on Wednesday. Buying of technology shares linked to the boom in artificial intelligence has been driving rallies worldwide. During Asia's day, Japan's Nikkei 225 gained 2.5% to 68,402.13.