The extent of the submarine movements went beyond what British officials had previously seen.
It is possible that a Russian spy ship collected information on the Israeli NIS Drakon submarine.
Yasen-class submarines are nuclear-powered cruise missile submarines, built to replace Soviet-era nuclear attack submarines.
A Russian submarine support ship was photographed by the Danish navy near the site of the Nord Stream pipelines, shortly before the attack last September.
Nuclear submarines are a huge tactical advantage and sharply increase a country’s ability to pose a serious threat.
Russia's Akula-class nuclear-powered strategic submarine Dmitry Donskoy is being decommissioned this week.
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