International trade is inherently political. While the Uniform Customs and Practice for Documentary Credits (UCP 600) were designed to be a neutral, universal set of rules for governing documentary credits, geopolitical events and economic sanctions have increasingly disrupted their application.
https://academy.iccwbo.org/trade-finance/article/geopolitics-sanctions-and-trade-finance-challenges-for-ucp-600-and-documentary-credits/