UK nuclear submarine deployed to Arabian Sea before Iran targets key US-UK base: reports

HMS Anson - a Royal Navy Astute-class submarine armed with Tomahawk Block IV cruise missiles and Spearfish heavyweight torpedoes - traveled about 5,500 miles from HMAS Stirling, near Perth, Australia, to the region earlier in March.

The outlet reported that Anson is typically based at Faslane in Scotland, where an Iranian man has been charged with attempting to gain entry.

In a statement, Downing Street said the aim of those operations was to "degrade the missile sites and capabilities" used in attacks on ships, while emphasizing that Britain does not want to be drawn into a wider regional conflict.

The attempted strike has raised concerns about Iran's missile range, as Diego Garcia is roughly 2,485 miles from Iran.

Iranian Foreign Minister Seyed Abbas Araghchi had warned Britain against supporting U.S. or Israeli military action, saying such involvement could further escalate the conflict.

Araghchi told U.K. Home Secretary Yvette Cooper that Iran views Britain's decision to allow U.S. forces to use its bases as "participation in aggression," according to his account of the call, the BBC reported.

He also criticized what he described as the U.K.'s "negative and biased" approach and demanded that it cease cooperation with the United States.

The U.K. did not allow the U.S. to use its bases for initial offensive strikes against Iran but later granted permission for defensive operations in response to Iranian missile threats.

Downing Street said: "We didn't participate in the initial strikes, and we're not getting drawn into the wider war."

Tehran has said it would exercise what it calls its right to self-defense if threatened.

Meanwhile, the U.K. Ministry of Defence said Sunday that Royal Air Force assets, including Typhoon jets, remain engaged in defensive operations in the region.

Fox News Digital has reached out to the U.K. Ministry of Defence for comment.