Reporting from Washington — Amid increasing suggestions that Israel might attack Iran’s nuclear facilities, Defense Secretary Robert M. Gates warned this week that such a strike would have dangerous consequences, and asserted that Tehran’s acquisition of a bomb can be prevented only if "Iranians themselves decide it’s too costly."

Using his strongest language on the subject to date, Gates told a group of Marine Corps students that a strike would probably delay Tehran’s nuclear program from one to three years. A strike, however, would unify Iran, "cement their determination to have a nuclear program, and also build into the whole country an undying hatred of whoever hits them," he said.