Amid fresh warnings that Russia is preparing “violent acts of sabotage” in Europe and NATO states, experts say there is already a significant uptick in what appears to be covert Russian sabotage

Jenny Mathers, a specialist in Russian intelligence services at Aberystwyth University in Wales, said there has been a notable increase in the number and intensity of Russia-linked incidents for the past year, adding that “we are likely to see an acceleration of this trend"....