Investing.com -- Global semiconductor stocks fell Friday, dragged lower by a sharp selloff in South Korean equities and mounting geopolitical uncertainty as U.S.-Iran talks showed no signs of progress.

Micron fell 2.3% in premarket trading more than 3% by 04:34 ET, while Nvidia dropped 2.3% and Broadcom shed 2.8%. AMD and Intel saw steeper declines of 3.4% and 5% respectively, with Dutch chipmaker ASML also falling 4.5%.

The moves tracked a broad selloff in Asia, where South Korea’s KOSPI sank more than 6%, pulling back from a record high above 8,000. Samsung Electronics and SK Hynix, the two largest stocks in the KOSPI index by market cap, fell sharply.

Samsung Electronics sank 8.6% after its labour union reaffirmed plans for an 18-day strike beginning May 21, rattling sentiment across the global chip supply chain. SK Hynix plunged 7.7%. The two stocks together account for a record 42.2% of the KOSPI, according to Manulife Investment Management.

Elsewhere, shares in European semiconductor companies also pulled back, with ASML, ASM International, and BE Semiconductor retreating by 4.6%, 4.2%, and 2.7%, respectively.

Investors were also watching the second day of summit talks between U.S. President Donald Trump and Chinese President Xi Jinping in Beijing. The two leaders agreed on the need to keep the Strait of Hormuz open, a shipping lane that Iran effectively shut down following U.S.-Israeli strikes that began on February 28, causing significant disruption to global energy supplies.

Trump said Thursday his patience with Iran was running out, after discussing the conflict with Xi and after Iranian personnel were reported to have seized a ship off the United Arab Emirates.

The U.S. paused its strikes on Iran last month but has since imposed a blockade on the country’s ports. Negotiations aimed at ending the conflict have stalled, with Iran refusing to abandon its nuclear program or give up its stockpile of enriched uranium.