MI6 spymaster cautions Russia but eyes China's growing power

FILE PHOTO: MI6 chief Alex Younger speaks at MI6's Vauxhall Cross headquarters in central London, in this still image from video, Britain December 8, 2016. Crown Copyright/Handout via REUTERS/File Photo

ST ANDREWS, Scotland (Reuters) - The chief of Britain's foreign intelligence service warned the Kremlin on Monday not to underestimate the West after a brazen nerve agent attack on a retired double agent in England stoked fears about Russian covert activity abroad.

In his second major speech since being named in 2014 to head the Secret Intelligence Service, or MI6, Alex Younger, ranged across the global threats faced by Britain as it prepares to exit the European Union in less than four months.