Asian stock markets experienced significant declines on Tuesday, with major indices in Tokyo and Seoul plummeting over 3%, mirroring a broader sell-off in U.S. markets driven by artificial intelligence (AI)-related stocks. The downturn was fueled by concerns over inflated valuations of tech companies, particularly Nvidia, which is set to release its earnings report on Wednesday. U.S. futures also dipped, with the S&P 500 contract down 0.6% and the Dow Jones Industrial Average futures falling 0.4%.