Iran says backing new U.S. sanctions will be treated as an act of war

JUST IN: Iran is warning that any country supporting new U.S. sanctions will be treated as committing an "act of war," according to Politico.
The warning significantly raises the stakes around Washington's latest economic pressure campaign.
If Iran retaliates against countries enforcing the sanctions, the confrontation could spread beyond the U.S.-Iran relationship and increase risks to regional trade, shipping and energy infrastructure.
Oil markets will be particularly sensitive to any sign that economic retaliation is turning into direct action against countries participating in the sanctions regime.