World shares are mixed and US futures fall after a tech-led rally on Wall St

World shares were mixed and U.S. futures fell as delayed U.S.-Iran nuclear talks and geopolitical tensions in Lebanon offset a tech-led rally on Wall Street. European markets saw modest gains, while Asian markets closed mixed or were shut for holidays. The U.S.-Iran agreement to end war and reopen the Strait of Hormuz failed to calm markets, and tech stocks like Intel and Nvidia drove gains in U.S. markets before a holiday closure.