Photo from UNIAN
The two countries' accounts have long been in an online spat.
Ukraine has described Russia as a "toxic ex" after the nation's official Twitter account shared images of the authors claimed were "good ol' days" of the Soviet Union.
"Many Ukrainians still remember the good ol' days, when Soviet Ukraine was the USSR's breadbasket, as well as a popular health tourism destination and industrial center," Russia tweeted, sharing photos from the time, Yahoo Finance reported.
"A lot of that, and much more, is available in Russia’s Crimea today."
In response, Ukraine highlighted the post by posting: "toxic ex here".
Ukraine achieved independence from the USSR (Union of Soviet Socialist Republics) in 1991 when the state was dissolved.
It had been part of the bloc since the 1920s after Soviet Russian forces overran the country and millions of Ukrainians died of starvation in the Holodomor famine manufactured under the control of Joseph Stalin – a crime for which the leader was posthumously found guilty of genocide.
Read alsoRussian 'military parades' in occupied Donbas, Crimea violate Ukrainian, international law – MFA
Since 2014, Russia has been in conflict with its neighbor after Kremlin forces invaded and annexed Ukraine's Crimea peninsula and then launched aggression in the Donbas region in Ukraine's east.
In another famous episode of the online feud, Ukraine ridiculed Russia for the attempt to expropriate the figure of French Queen Anne of Kyiv as "Russian".