Armed with Tomahawk cruise missiles and Spearfish heavy torpedoes, the HMS Trenchant is the first British nuclear sub to be deployed under the Arctic ice in a decade.
It joined a pair of the US Navy’s fast attack submarines the USS Hartford and USS Connecticut, both of which surfaced in the Arctic Circle on March 10 as part of the multinational maritime Ice Exercise 2018.
Russian officials have strongly denied the accusations, with Foreign Minister Sergei Lavrov saying that Moscow is ready to cooperate in the probe but needs to look at the samples of the substance in question.
On March 4, Sergei Skripal, who was accused of espionage on behalf of London and later granted asylum in the United Kingdom after a US-Russia spy exchange, and his daughter were found unconscious on a bench at a shopping center in Salisbury.
Both of them remain in critical condition and are being treated for suspected exposure to a nerve agent.
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