https://www.reuters.com/article/us-china-semiconductors-taiwan-analysis/chinas-ties-with-taiwan-chip-firms-under-scrutiny-as-u-s-trade-war-heats-up-idUSKCN1NB2WP >Washington's decision to cut off U.S. supplies to a Chinese chip-maker spotlights mounting tensions over China's drive to be a global player in computer chips and the ways in which Taiwan companies are helping it get there.