In early April, hours after US President Donald Trump threatened to bomb Iran “back to the Stone Ages” in a prime-time address, China’s yuan-denominated cross-border payment system set a record for transaction volume in a single day. The Cross-Border Interbank Payment System (CIPS) skyrocketed to 1.22 trillion yuan (US$180.3 billion) on April 2, almost doubling the daily average volume in February. The spike occurred as more oil-producing nations rapidly scaled up their share of yuan settlements...