As a foreign policy tool, trade embargoes, such as US embargoes against Cuba, Iraq (until 2003),Iran, North Korea and China, are m

As a foreign policy tool, trade embargoes, such as US embargoes against Cuba, Iraq (until 2003),Iran, North Korea and China, are meant to discourage foreign governments.  But they also cause a great deal of misery among the population (such as shortages of medicine and food).  Are embargoes ethical?