The US has announced plans to take strong measures against countries doing business with Iran. A specific country is believed to be the focus of this warning, according to experts. The US Treasury Secretary promised a significant economic response to countries purchasing Iranian oil.

Further details are available from the source, including statements from the US Treasury Secretary. The potential repercussions of these measures could be far-reaching, affecting multiple countries and possibly even US consumers.

The US Treasury Secretary's statement suggested that diplomatic efforts are underway to communicate expectations to individual countries, with the goal of influencing their actions regarding Iranian oil purchases.