Gulf Cooperation Council (GCC) member states are united in their common desire for a ceasefire in Gaza. The prevention of a further regionalization of Israel’s war on the coastal enclave is a top priority for the Gulf Arab monarchies, which have much to lose from the potential for worsening spillover effects.

Reactions to the killing of Hamas political bureau chief Ismail Haniyeh in Tehran late last month have highlighted how GCC capitals perceive Israeli aggression as threatening regional stability and heightening the risk of a...