Commenting on the report, Zakharova said: "The accusation of spying activities by employees of the Russian Embassy in Chisinau is unfounded. It is a fantasy which has nothing to do with reality."
Belavin had allegedly detonated the device on July 9 last year, damaging a passing freight train and the track below, according to investigators
The FSB claims to have seized more than 4 kg (9 pounds) of plastic explosives, four detonators, military design documentation and $150,000 in cash.
The theory of Israeli superiority clashes with the increasing sense of self-confidence that Iran has felt in recent years, especially since the qualitative advancement in its military arsenal.
Russia's intelligence agency recently stated that iPhones are infected with malware and can be used for espionage.
A large amount of other sensitive material was found at Mar-a-Lago, including government documents that Trump was allegedly not cleared to take with him when he left office.
Poland says it has become a major target of Russian spies and it accuses Moscow of trying to destabilize it.