Why is Egypt so wary of getting involved in Yemen’s conflict?

Egyptian forces arrived in Yemen in the thousands, backing the country’s government in a civil war against rebels that threatened to overthrow it.

But this is not today’s war – this is 1962, and the Egyptians were supporting republican forces in North Yemen against the country’s royalists. The intervention came after Yemenis who were friendlier to the Arab nationalist ideology propagated by Egyp...