The "fake news", or as called before "propaganda" originated actually in the old Soviet Union under Stalin and Lenin, and was later exported to the other communist countries.
I lived through it myself until my early twenties. Listened in secret to Radio Free Europe from an early age, and that helped to make sense of the convoluted news in official radio and newspapers, but many people ate up those news wholesale, and then in 1989 when the velvet revolution came, they felt cheated, confused and scared. They didn't know whether to believe the old communist propaganda or the new pro-western publications.
Sadly, now almost 30 years after the liberation from the old Soviet system, many of the previous satelite states are still not used to democracy, how to interpret the news and the art of making compromises, and that this leads to ongoing corruption and fake news fabrication. This is the case not only in Ukraine, but also in Czechia, Slovakia, Poland and Hungary. You can corrupt decent people in one generation, but it may take 3-5 generations to undo the damage.