Commerce Secretary Gina Raimondo said the US "firmly opposes" the ban and that it is working closely with allies to address such "coercion"

South Korea is in the crosshairs of a tit-for-tat row between China and the United States over semiconductors

Stocks of China's semiconductor companies have seen large gains since March with NAURA Technology Group up 14%, Piotech up 45% and ACM Research Shanghai up 19%

“We can theoretically build chips outside of Taiwan, it’s possible [but] the China market cannot be replaced. That’s impossible,” Huang told FT

Officials from the world's biggest economies will meet on Thursday to 'thaw' tense relations, complicated by China's recent ban on Micron and a tough stance against Beijing by G7 nations

South Korea's Samsung and SK Hynix, the world's top two makers of memory chips, have invested billions of dollars in chip factories in China

"It takes huge amounts of pre-emptive investment to be a chipmaker, and it takes five years, 10 years to break even on those investments, so putting predictability into jeopardy makes investments difficult," an analyst said

The development comes at a time when the US is increasingly urging its allies to work together to counter China's chips and advanced technology development

A $2.6 billion share sale, if approved by China’s securities watchdog, would follow a capital raising rush by Chinese chipmakers in the face of US sanctions

"This export restriction is noticeable, but it's not quite as devastating as it could have been," one expert said

The “top secret project” is aimed at realising Beijing’s ambitions of becoming self-reliant in critical semiconductor technology

Washington has asked Seoul to encourage Samsung and SK Hynix to hold back from boosting China sales if Micron is banned as a result of an ongoing investigation