A notorious Israeli mob boss was gunned down at a gas station — with shocking video showing his assassin creeping up to shoot him at point-blank range from behind. Yanis Yushvaev, the head of the Caucasian Mafia and one of Israel’s most dangerous criminals, was gunned down in Caesarea on Sunday — 10 years after surviving an assassination attempt. The killer, in a gray hoodie and baseball cap, was seen following the mob boss and two friends out of the gas station — then whipping out a handgun and shooting from a blank range on the steps, video shared by...