Iran readies harder retaliation if attacked as diplomacy faces long odds

Iran is preparing a broader and more forceful response if the United States resumes large-scale military attacks, sources said, while continuing a diplomatic push that Iranian officials privately see as unlikely to succeed, Reuters reported. 

The planning reflects a conviction within Iran's ​leadership that any renewed US campaign must be met with a stronger response than before, even as Tehran seeks to avert escalation through talks.