US Secretary of State Mike Pompeo threatened Monday to impose the "strongest sanctions in history" against Iran if it did not accept a series of demands from the Donald Trump administration, which includes effectively give up nuclear power initiatives and its conventional ballistic missile program. He warned that the United States would "crush" Iranian operatives and allies abroad and told Tehran to withdraw all forces under its command from the Syrian civil war where they back President Bashar al-Assad. "These will be the strongest sanctions in history by the time we are done," he added.