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Iran steps up claim to control Strait of Hormuz

May 21, 2026

Iran has announced a major expansion of its claimed military control over the Strait of Hormuz region, asserting authority over approximately 22,000 square kilometers that extends into Omani and UAE territorial waters through a newly established Persian Gulf Strait Authority. The UAE has strongly rejected these claims, describing them as unrealistic fantasies following Iran's military setbacks. This escalation occurs amid ongoing tensions, with the US conducting a blockade of Iranian ports that has redirected 94 commercial vessels since mid-April, and Iran allegedly striking tankers in the strait.

Who is affected

  • Iran (asserting expanded military control)
  • Oman and the UAE (territorial waters being claimed by Iran)
  • Ships and tankers transiting the Strait of Hormuz
  • United States military forces
  • Liberian-flagged tanker Barakah (reportedly struck in early May)
  • Oil tanker Celestial Sea (boarded by US forces)
  • Gulf states: Qatar, Saudi Arabia, and the United Arab Emirates
  • Pakistan (mediating negotiations)

What action is being taken

  • Iran's Persian Gulf Strait Authority is claiming military oversight over an expanded area around the Strait of Hormuz
  • The US is conducting a blockade of Iranian ports (in effect since April 13)
  • US forces are boarding and redirecting commercial ships suspected of violating the blockade
  • Pakistan's military chief Asim Munir is visiting Tehran to mediate peace efforts
  • Iran's foreign ministry is reviewing the latest US proposals for ending the conflict
  • Negotiations are taking place between the US and Iran

Why it matters

  • The Strait of Hormuz is a critical global trade route, making control over this waterway strategically and economically significant. Iran's attempt to expand its claimed authority threatens freedom of navigation and escalates regional tensions with Gulf allies and the United States. The situation has already resulted in military actions including a US blockade, vessel boardings, and reported strikes on tankers, creating risks for international shipping and potentially disrupting global oil supplies that transit through this narrow waterway.

What's next

  • Trump stated he could wait a few days for Tehran to agree to a new deal but is willing to resume attacks if satisfactory answers are not received
  • Pakistan's military chief is continuing talks with senior Iranian officials
  • Iran is reviewing the latest US proposals on ending the conflict
  • The US remains "ready to go" with military action if negotiations fail

Read full article from source: BBC

Iran steps up claim to control Strait of Hormuz