U.S. Secretary of State Marco Rubio called on the United Nations to adopt a resolution condemning Iran for closing the Strait of Hormuz on Tuesday [1].

The move signals a high-stakes attempt by the U.S. to mobilize global diplomatic pressure against Tehran. Because the Strait of Hormuz is a critical artery for global energy supplies, any prolonged closure threatens international economic stability.

Rubio addressed the United Nations, urging the international community to join the U.S. effort to impose a cost on Iran [1]. He said the situation is a straightforward issue that requires a unified global response to maintain maritime security.

Rubio questioned the fundamental purpose of the international body if it cannot coordinate a response to the closure. He said that the failure to rally countries behind such a resolution would cast doubt on the organization's effectiveness [1].

"If you’re telling me that the international community and hundreds of countries cannot rally behind that, then I don’t know what the utility of the U.N. system is, if it can’t even solve something as straightforward as that," Rubio said [1].

The Secretary of State said the current crisis is a real test for the UN system [1]. He said that the ability of the world to act in concert against the closure would determine whether the UN remains a relevant tool for solving global conflicts.

The whole world should join us

By framing the closure of the Strait of Hormuz as a test of the UN's utility, the U.S. is attempting to isolate Iran diplomatically. If the UN fails to pass a resolution, it may provide the U.S. with a justification to pursue unilateral actions or alternative security coalitions outside of the traditional UN framework.