Kyiv, June 27 -- Ukraine launched a major night-time attack on a dozen Russian regions, Russian-held Crimea and the surrounding seas, Moscow's Defence Ministry said on Friday, in what appeared to be one of Kyiv's biggest drone assaults since the Kremlin's full-scale invasion more than four years ago. Russian air defences intercepted 660 Ukrainian drones, Russia's Defence Ministry said. The previous biggest Ukrainian attack over the past year, as Ukraine has accelerated its drone development, involved 556 drones on May 17. In an effort to turn the tables on Russia's war of attrition, Ukrainian long-range drones have been battering oil production and energy facilities behind the front line and deep inside Russia. The campaign has choked Russi...