https://www.reuters.com/article/us-southkorea-japan-laborers-chip-analys/south-korean-chip-giants-face-strangling-from-japanese-export-curbs-idUSKCN1UR3LZ >South Korean chipmakers are hitting a dead end in their quest to find alternatives for key Japanese materials that have been slapped with export restrictions, raising the prospect of major disruption to their operations in the coming months.