U.K. Spy Agency Confronts Escalating Hybrid War With Russia and Iran

Head of MI5 paints sobering picture of range of threats facing Britain and European allies LONDON—The U.K.’s domestic intelligence agency is devoting more resources to countering state threats than during the Cold War, as Britain looks to fend off escalating hybrid attacks from Iran and Russia.Ken McCallum, the director general of MI5, said the country “had entered a new era of national security” as intelligence services face a growing waterfront of risks that extend far beyond the traditional threat posed by Islamist terrorists.“These days our terrorist and state threats operational missions are pretty much of equal scale: that in itself...