Asian stock markets slide, U.S. futures retreat as tariff turmoil continues

Overseas financial markets plunged in early trading Monday, while U.S. stock futures came under renewed selling pressure after leading indexes crumbled last week amid investor fears over the economic fallout from the Trump administration's latest tariff salvo.

Japan's Nikkei 225 index tumbled nearly 8% shortly after the market opened in Tokyo, and Australia's S&P/ASX 200 dropped more than 6%. South Korea's Kospi lost 4.4%.