South Korea's KOSPI fell about 3.1%, or more than 3%, to around 6,685 on Monday, extending a three-session decline as Middle East supply risks pushed oil above $100 a barrel and higher bond yields renewed doubts about the durability and returns of the artificial-intelligence investment cycle. SK hynix fell between 4.3% and more than 6% in different intraday reports, while Samsung Electronics declined between 2.5% and nearly 4%. A vessel strike in the Strait of Hormuz and Saudi Arabia's shutdown of its East-West crude pipeline after drone attacks heightened concerns about energy costs for South Korea. Investors also awaited Federal Reserve and Bank of Japan policy decisions, with markets pricing an 86% chance of a 25-basis-point Federal Reserve rate increase and a high probability of a Bank of Japan hike.