China is a key market for Micron and generated around 10% of its full-year sales. In 2022, Micron reported total revenue of $30.7bn (£24.6bn), of which $3.3bn came from mainland China. China says products made by US memory chip giant Micron Technology are a national security risk. It is China’s first major move against a US chip maker, as tensions increase between Beijing and Washington. It means the firm’s products will be banned from key infrastructure projects in the world’s second largest economy. Is this a fair play between Beijing and Washington ?