SEOUL/SHANGHAI  -A move by Beijing to bar U.S. firm Micron Technology Inc from selling memory chips to key domestic industries has ramped up tensions in an ongoing trade spat with Washington and lifted shares of firms that could benefit from the move. China’s cyberspace regulator said late on Sunday that Micron, the biggest U.S. memory chipmaker, had failed its network security review and that it … Continue reading China’s Micron ban revives US trade tensions, fuels Asian chip rally