Silicon Valley's sell-off gathers speed in Asia, with chip-heavy indices bearing the brunt of the declines, while tensions in Iran send oil prices higher.
The selling intensified Monday as the benchmark Kospi plunged more than 8% at the open, even as it emerged as one of the world's standout performers thus far.
North Korea may use the summit as an opportunity to press for economic concessions or Beijing's "tacit recognition" of its nuclear status, analysts say.