Washington DC: US Secretary of State Marco Rubio has criticised Iran's reported consideration of a tolling system for vessels passing through the Strait of Hormuz, arguing that such a move would set an unacceptable international precedent and complicate already delicate negotiations between the two countries.

Speaking on Thursday, Rubio stressed that the strategic waterway does not belong to any single nation and warned that allowing transit fees in one of the world's most important maritime chokepoints could encourage similar measures elsewhere. He said the consequences could spread beyond the Gulf region and affect international shipping routes around the world.

The comments come as the United States continues negotiations with Iran over broader regional and security issues. While expressing hope for a positive outcome, Rubio said Washington was not seeking an agreement "at any price" and would ensure that any deal protects the interests of US allies and partners.

His remarks underscore the challenges facing ongoing diplomacy. Analysts note that public warnings over Hormuz access, coupled with continued disagreements over regional security arrangements, risk adding new friction to efforts aimed at reducing tensions between Washington and Tehran.

The Strait of Hormuz remains one of the world's most critical energy corridors, handling roughly one-fifth of global oil shipments. Any uncertainty surrounding access to the route is closely watched by governments, shipping firms and energy markets.

Despite Rubio's comments, oil markets showed little immediate reaction. US benchmark WTI crude traded near $69.50 per barrel, remaining close to levels seen before the recent escalation in Middle East tensions.

The latest exchange highlights how disagreements over strategic waterways and regional influence continue to complicate US-Iran relations, even as both sides publicly express interest in reaching a lasting diplomatic understanding.