The tip was sent by a city tech worker: a single person could, in one fell swoop, disable almost every traffic light in Vilnius, Lithuania's capital. It proved true, says Au-rimas Navys, a former officer at Lithuania's State Security Department. Mr Navys, who had received the tip despite his recent retirement, made sure the vulnerability was fixed. Lithuania and the other Baltic states, Estonia and Latvia, all nato members, are scrambling, he says, to identify such weaknesses and the individuals who might exploit them on behalf of Russia. Mr Navys reckons that the defensive efforts of the Baltic states have multiplied tenfold since 2014. That was when Russia seized Crimea and, in Ukraine's east, set off separatist fighting that continues today.
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