Global markets opened lower on Tuesday, December 30, with Asian indices like Japan's Nikkei and South Korea's Kospi experiencing declines. US markets also closed down Monday, impacted by pressure on AI stocks. The S&P 500, Nasdaq, and Dow Jones all saw decreases. The US Dollar Index saw a slight increase, while the Indian rupee depreciated. This follows a downbeat trading session for India's Nifty 50 and Sensex on the preceding Monday.