According to dennis ross, a former white house advisor on iran, the key to effective coercive diplomacy is

to offer a way out

Explanation:

According to my research on statements made by Dennis Ross, I can say that based on the information provided within the question he states that the key to effective coercive diplomacy is to offer a way out. Coercive Diplomacy is an attempt to get a government, state, or country to change its way of being through either the threat to use force or the actual use of limited force. If you do not provide a way out for the party being threatened then this stops being a threat and turns into inevitable action, since they are not being given the option to prevent it.

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there is an explationation of this on a site called crash   course world history 1

answer; bonds; i believe this is the correct answer good luck