Sensex tanks 1,500 points to 79,000 in early trading, while Nifty drops 489.65 points to 24,228.05. Asian stock markets saw significant losses on Monday, with Japanese indices notably affected. The Nikkei 225 index fell over 1,600 points, or 4.85%, to 34,247.56, marking a 20% decline from recent all-time highs.