As Russia fails to gain ground in the war in Ukraine, President Vladimir V. Putin appears to be pursuing a wider conflict in Europe, increasingly targeting critical infrastructure and supply chains, one of Britain’s highest-ranking intelligence officials said in prepared remarks. “Russia is scaling up its daily hybrid activity against the U.K. and Europe,” said Anne Keast-Butler, director of GCHQ, the British electronic surveillance agency, which has been countering what she called the Kremlin’s “reckless sabotage and assassination attempts.” Ms. Keast-Butler’s remarks are part of an annual speech she is…