This topic has always fascinated me.
““This mental image that everyone has, that we don’t trade with our enemies during war, is actually an artifact of the world without any neutral rights,” Grinberg says. “Once we develop neutral rights, all bets are off, and now we have wartime trade.””
https://news.mit.edu/2025/why-countries-trade-each-other-while-fighting-mariya-grinberg-book-0828