US airstrike in Syria sends message to Iran

A US airstrike targeting facilities used by Iran-backed militias in Syria appears to be a message to Tehran delivered by a new American administration still figuring out its approach to the Middle East. The strike was seemingly a response to stepped-up rocket attacks by such militias that have targeted US interests in Iraq, where the armed groups are based. It comes even as Washington and Tehran consider a return to the 2015 accord meant to rein in Iran’s nuclear program.