As South Korean President Yoon Suk-yeol heads to Washington for a visit, the Financial Times is reporting that the White House has asked Seoul to urge its chipmakers (Samsung Electronics and SK Hynix) not to fill the China shortfalls of US rival Micron in the event of a ban by Beijing. Such a move would be the latest in an escalating tech rivalry between the United States and China. Also in this edition, we take a closer look at Chile's decision to nationalise its lithium supply.