Iran on July 19, 2019, said it seized a British oil tanker and its crew amid reports it diverted a second tanker toward Iran within hours of the seizure in a clear message to the UK and the US that it's willing to get aggressive in a feud over oil sanctions. But it may soon have to contend with heavy US and UK naval firepower already in the region.
The US sent its USS Abraham Lincoln aircraft carrier and attached strike group to the region in May 2019. This represents the world's most potent unit of naval power, with the aircraft carrier's formidable air wing, a cruiser, four destroyers, and support ships.
The USS Boxer, a smaller carrier for AV-8B Harrier jets and helicopters, is also operating nearby and said it recently downed an Iranian drone. Iran denied this and posted video of one of its drones landing to challenge the US's narrative, although it's unclear if Iran's footage proves anything.