In this age of modern warfare, the U.K. might already be at war with Russia, according to the former head of Britain's domestic intelligence agency. Baroness Eliza Manningham-Buller, who led MI5 from 2002 to 2007, told the Lord Speaker's Corner podcast that Russia's escalating hybrid warfare tactics indicate a sustained campaign of hostility against Britain and its allies, The Times U.K. reported Monday. "Fiona Hill may be right in saying we're already at war with Russia," Manningham-Buller said, referencing the prominent foreign policy expert and Vladimir Putin biographer who was key in testifying against President Donald Trump in the first...