The U.S has disclosed its intent to launch a 'total economic attack' against Iran, further escalating tensions between the two nations. This development is in line with the tightened sanctions that the U.S aims to impose on Iran, asserting their stand on nuclear disarmament. The impact and nuances of this move are yet to unfold, and global responses are highly anticipated.

Japan has had a traditionally cordial relationship with Iran, and this declaration could significantly impact the Japanese economy and its foreign relations stand. Japanese businesses could potentially bear the brunt of these sanctions due to their trade relationships with Iran. Japan's response to this announcement is expected to balance its relations between both countries.

In contrast, the European Union (EU) and the US have had marked differences in their approach towards Iran. While the EU has been trying to uphold the nuclear deal with Iran, the US has pulled out from the same agreements. Therefore, the EU's response to this 'total economic onslaught' will be watched closely.