FILE - In this In this July 21, 2019 file photo, a speedboat of Iran's Revolutionary Guard trains a weapon toward the British-flagged oil tanker Stena Impero, which was seized in the Strait of Hormuz on July 19 by the Guard, in the Iranian port of Bandar Abbas. Iranian forces seized a ship in the Persian Gulf suspected of carrying smuggled fuel, state media reported Sunday, Aug. 4, 2019, marking the Revolutionary Guard's third seizure of a vessel in recent weeks and the latest show of strength by the paramilitary force amid a spike in regional tensions. State TV and the semi-official Fars news agency reported that seven crew members were detained when the latest ship was seized late Wednesday. (Morteza Akhoondi/Tasnim News Agency via AP, File)

TEHRAN, Iran (AP) — The Latest on tensions in the Persian Gulf (all times local):

5:25 p.m.

Britain says it will work with the United States in a "new international maritime security mission" to protect merchant shipping in the Strait of Hormuz.

The Ministry of Defense said Monday that Royal Navy vessels will work alongside the U.S. Navy to escort vessels through the busy strait, which has become a flashpoint for tensions between Iran and the West.

The U.S. has been asking its allies to take part in a naval mission to protect shipping in the Strait of Hormuz, though European nations have been reluctant.

Britain has been giving U.K.-flagged vessels a naval escort since Iran's Revolutionary Guard seized a British oil tanker last month.

Britain has two Royal Navy vessels in the region, the frigate HMS Montrose and the destroyer HMS Duncan. The Montrose is due to leave for repairs later this month.

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11:00 a.m.

Iran's foreign minister has lambasted the recent U.S. sanctions against him, calling the move a "failure" for diplomacy.

Mohammad Javad Zarif told reporters in Tehran on Monday that "imposing sanctions against a foreign minister means failure" for any efforts at negotiations. It also means the side imposing the measures is "opposing talks."

The U.S. administration last week announced sanctions on Zarif, a month after President Donald Trump imposed similar sanctions on Iran's supreme leader, Ayatollah Ali Khamenei.

The move is seen as part of Washington's escalating campaign of what Trump calls "maximum pressure" on the Islamic Republic.

The U.S has increasingly deployed military to the region as tensions have been on the rise since Trump's withdrawal last year from the 2015 nuclear deal between Iran and world powers.

This Monday, July 22, 2019 Maxar Technologies shows an overview of Iranian port city of Bandar Abbas with the British-flagged oil tanker Stena Impero at the top center. President Hassan Rouhani suggested on Wednesday, July 24,  that Iran might release the U.K.-flagged ship if Britain takes similar steps to release an Iranian oil tanker seized by the British Royal Navy off Gibraltar earlier this month. His remarks could create an opening to reduce tensions as Boris Johnson becomes prime minister.   (Satellite image ©2019 Maxar Technologies via AP)
This undated image made from a video provided by the IRGC/IRIB shows a ship in the Persian Gulf. Iranian forces seized the ship, which it suspected of carrying smuggled fuel, state media reported Sunday, Aug. 4, 2019, marking the Revolutionary Guard's third seizure of a vessel in recent weeks and the latest show of strength by the paramilitary force amid a spike in regional tensions. (IRGC/IRIB via AP)
FILE - In this Nov. 9, 2013, file photo, Iranian Foreign Minister Mohammad Javad Zari, center, leaves following a meeting with EU foreign ministers at the Iran Nuclear talks in Geneva, Switzerland. The U.S. government is placing financial sanctions on Iran’s foreign minister Mohammad Javad Zarif, as part of its escalating pressure campaign against that country. The highly unusual action, sanctioning the top diplomat of another nation, comes a month after President Donald Trump signed an executive order placing sanctions on Iran’s Supreme Leader Ayatollah Ali Khamenei. (Jason Reed/Poo Photo via APl, File)
Iranian Foreign Minister Mohammad Javad Zarif speaks at a press conference in Tehran, Iran, Monday, Aug. 5, 2019. Zarif lambasted the recent U.S. sanctions against him, calling the move a
This Monday, July 22, 2019 Maxar Technologies shows a close up of British-flagged oil tanker Stena Impero at the Iranian port city of Bandar Abbas.  President Hassan Rouhani suggested on Wednesday, July 24, that Iran might release the U.K.-flagged ship if Britain takes similar steps to release an Iranian oil tanker seized by the British Royal Navy off Gibraltar earlier this month. His remarks could create an opening to reduce tensions as Boris Johnson becomes prime minister.   (Satellite image ©2019 Maxar Technologies via AP)