DUBAI/MANILA: US Secretary of State Marco Rubio said on Wednesday the United States is still willing to negotiate an end to the Iran crisis but Tehran is not serious about talks, as the widening conflict disrupted two of the world’s most critical energy chokepoints.

Rubio made his comments in a meeting of Southeast Asian foreign ministers after Yemen’s Iran-aligned Houthis claimed a naval blockade has been imposed on the Red Sea mainly against Saudi Arabia.

With Iran already threatening shipping through the Strait of Hormuz leading out of the Gulf, the Red Sea has served as the main alternate route out for millions of barrels ‌of Saudi oil per ‌day.

A senior Iranian official told Reuters on Monday that Tehran had received a proposal from mediators for ‌a ⁠10-day ceasefire in efforts ⁠to salvage the interim ceasefire agreement signed by the US and Iran in June, which replaced an earlier April ceasefire.

In another sign that diplomacy remains alive, Iran’s Interior Minister Eskandar Momeni has visited mediator Pakistan and asked Islamabad to continue its efforts.