Britain’s spy agency has advised vigilance against Russian and Chinese agents, even during casual conversations MI5 has issued guidance to UK politicians and their staff on how to spot potential Russian or Chinese spies in their day-to-day activities. According to a new guide released on Monday by MI5’s National Protective Security Authority (NPSA), the UK has been the target of “long-term strategic foreign interference and espionage” from Russia, China, and Iran. The document warns that