With the announcement this week that it has begun to enrich uranium above the 3.67 percent limit allowed by the 2015 international deal curbing its nuclear program, Iran has opened another round of high-stakes signaling with the Trump administration, which withdrew from the agreement last year, and the European nations that helped negotiate it. The move is the latest attempt by Iran to impose costs both on Washington for having reimposed punishing economic sanctions, and on Europe for its inability to mitigate their pain. The incremental but reversible breach of the Joint Comprehensive Plan of Action, or JCPOA, as the […]