New Delhi, June 8 -- The warning came not from a general or an IRGC commander but from the man who chairs Iran's parliament. Hours after Israeli aircraft struck the Dahiyeh district of southern Beirut on Sunday, Mohammad Bagher Ghalibaf posted a declaration that cut through the diplomatic noise around the ceasefire: Washington's support for Israel has made American and Israeli bases in the region legitimate military targets.

Hezbollah's stronghold in Beirut's southern suburbs has been struck repeatedly since the broader conflict escalated - but the timing raised immediate alarm. A fragile ceasefire and ongoing U.S.-Iran negotiations had made Dahiyeh something of an informal red line. Sunday's strike crossed it.

Ghalibaf, who also chairs...