A Royal Navy warship has tracked two Russian submarines sailing in the North Sea.
British submarine hunter HMS Portland monitored cruise missile submarine Severodvinsk and Akula-class attack submarine Vepr as they travelled underwater along the Norwegian coast from the Arctic.
The Type 23 frigate shadowed the submarines as they surfaced separately in the North Sea, north west of Bergen, Norway, on 16 and 19 July, before Nato and Baltic forces took over duties as they continued to St Petersburg for Russian Navy Day celebrations on 31 July.
