South Korea's tech-heavy Kospi index falls 10%, dragged down by SK Hynix and Samsung; STMicro and ASML fall ~7%, and US tech stocks fall in pre-market trading (Chloe Taylor/CNBC)

Chloe Taylor / CNBC:
South Korea's tech-heavy Kospi index falls 10%, dragged down by SK Hynix and Samsung; STMicro and ASML fall ~7%, and US tech stocks fall in pre-market trading  —  Global stocks sold off on Tuesday, led by deep losses for tech stocks following a losing session for the sector on Wall Street.