Shares have opened lower in Europe. Asian shares were mixed and Japan's Nikkei 225 index topped 68,000 after U.S. stocks pushed further into record territory.

Shares have opened lower in Europe. Asian shares were mixed and Japan's Nikkei 225 index topped 68,000 after U.S. stocks pushed further into record territory.

Asian stocks followed Wall Street higher, driven by renewed enthusiasm for AI-linked equities, pushing the S&P 500 to a ninth consecutive gain. The yen neared the 160-per-dollar…