Kremlin bots have started , claiming he is a "clown" who suffers from "dementia".
A sudden shift came after the US president accused Vladimir Putin of having gone "absolutely CRAZY!"
Trump - referring to Russia's relentless missile and drone strikes on Ukrainian civilian targets - also said: "I don't know what's wrong with him. What the hell happened to him?"
Officially, Putin's spokesman Dmitry Peskov claimed that Trump was suffering from an "emotional overload".
Lately, sensing Trump's support for Putin over Ukraine, comments have been restrained or positive.
But after the "crazy" tirade, Putin propaganda bots - automated or semi-automated online accounts massively used to disseminate Russian government or intelligence service narratives backing the dictator - went into overdrive, according to monitoring outlet Botnadzor.
"It's not Putin who's gone crazy, but Trump, apparently, this is hereditary for all US presidents, a chair and dementia as a gift," claimed one troll.
Another comment posted on social media stated: "What can you expect from a clown who, instead of taking care of the country, only ....threatens Russia."
Trump was accused of "throwing a tantrum early in the morning."
The Kremlin bot warriors accused of suffering "seasonal bipolar disorder", and asked if he is "blind or what?"
An automated bot - named Batyurkan Markushbekov - said: "Success on the battlefield - that's what Russia should strive for, as it initially took a peaceful path to resolve the conflict, and stepping away from it is absolutely unacceptable."
Another said: "Trump's just raging because he has no power over Russia. He just loves to boss people around."
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