Global stock markets slid sharply on Tuesday. Japan’s Nikkei dropped 1.6%. Hong Kong’s Hang Seng fell 1.5%. South Korea’s Kospi sank 2.2%. U.S. stock futures also turned lower, with S&P 500 futures down 0.5%, as investors waited for key U.S. jobs data. Markets are bracing for volatility. The next move could set the tone for weeks ahead.