The answer to that question is the answer to what must be done to prevent Iran from becoming a Nuke Nation. Appeasement has never worked but only emboldened the aggressor nation, that's what history has taught us. It is a lesson the world should not forget. At this point in time Iran poses little threart to the world now is the time to act, their bellicose statements indicate their fear and they are attempting to use it as a delaying tactic.
15 police officers killed in Colombia helicopter crash (Reuters)
from the article: U.S. strike on Iran likelier than ever, former CIA chief says