Not at all, but it does usually signal a degradation in the diplomatic relationship between two entities, so you often see it in the run-up to war. Withdrawing

Not at all, but it does usually signal a degradation in the diplomatic relationship between two entities, so you often see it in the run-up to war. Withdrawing or ejecting embassy staff has an impact on a governments ability to represent and assist individuals and businesses of your nation in a country, which is why ejection is a strong stick in the diplomacy game, but in Cuba, the historical situation would simply result in this being a return to a pre-Obama diplomatic situation.