I read somewhere (can't remember where, can't find it now, but it was in English) that the antivaccine scare is being spread by, amongst others, Russian troll bots. The point is not that Putin wants Western kids to die of measles, of course, it's that it stirs up controversy and spreads disharmony and distrust (of governments and probably more generally of organised medicine on the part of the antivacciners, of antivacciners on the part of the provacciners).