This kind of manipulation of public opinion not only by domestic, but also by foreign interests is probably going to become more relevant in this decade because newspapers and much else of the print media are being squeezed by low demand for their products in face of digital alternatives. I suspect so because of journalist layoffs and the widespread use of ridiculously poorly paid authors
Much non-journalistic content is already in what at least had the ambition of being news media; a typical example is a de facto promotion for a product or brand, camouflaged as journalistic content.
A covert advertisement for a skin cream isn't going to kill us, of course. Foreign agents placing paid opinion and distortions into national media can have a much more security policy-related effect.