Spoof comments appeared in the wake of a broadcast including Alexander Petrov and Ruslan Boshirov - who British authorities believed targeted former Russia spy Sergei Skripal and his daughter in March this year.
The pair told Margarita Simonyan, the editor-in-chief of RT (formerly Russia Today), that they were visiting the Wiltshire city as tourists eager to see the "famous Salisbury Cathedral".
Among the apparently false reviews later spotted on TripAdvisor, one read: "I wanted to visit the WorldWide famous town of Salisbury since I was a boy. Could say it was eventful."
Asked about their intention for visiting Salisbury, Mr Petrov and Mr Boshirov said: "Our friends had been suggesting for a long time we visit this wonderful town.
"There's the famous Salisbury cathedral, famous not only in Europe but in the whole world, it's famous for its 123 metre spire.
"It's famous for its clock, one of the first [of its kind] ever created in the whole world which is still working."
One comment to appear on TripAdvisor following the interview said: "Came all the way from Russia to see the spire, which is 123 metres tall you know.
"Wonderful place to visit and very glad we came. We came two times. All just a short 3,000km hop from Moscow, well worth it!"
While another said: "Me and my co-assassin, sorry, 'tourist' went there because the big man (Putin) needed a loose end sorting out...
"It was a bit cold, and didn't like it much, so we went home again."
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