I can think of a dozen reasons why someone might supply a Russian passport to a hired hitman to bump off someone in Cyprus. It's swimming in laundered Russian cash for a start.

ISRAEL HAS ACCUSED IRAN of being behind a plot to kill Israeli citizens in the Republic of Cyprus, following the arrest of a man who was reportedly found carrying a gun fitted with a silencer in the Cypriot capital Nicosia. The man reportedly entered Cyprus on a flight that landed at Larnaca International Airport last week. He is believed to be a 38-year-old Azeri national, who allegedly entered Cyprus using a Russian passport.
Cypriot police kept tabs on the suspected assassin as soon as he entered Cyprus, according to reports. IntelNews hears that the Israeli intelligence agency Mossad may have been behind a tip given to the Cypriots about the man’s presence on the island. In the days following his arrival, the suspect crossed several times into the Turkish-occupied northern region of Cyprus, using his Russian passport and “trying to keep a low profile”, according to Israeli media reports.
The Azeri man was eventually arrested in Nicosia, shortly after entering from northern Cyprus at the Agios Dometios checkpoint. Some local news reports suggest that he was found to be carrying a gun fitted with a silencer, and that he was planning to target a number of prominent Israeli business people who live on the island. Reports in Israel claim that the alleged assassin’s primary target was Teddy Sagi, an Israeli investor who owns online gambling platforms, as well as properties in the United Kingdom and Cyprus. He is believed to be among Israel’s richest citizens.
Iran has vehemently denied Israel’s claim that Cypriot police averted “an act of terror [that] was orchestrated by Iran against Israeli business people” in Cyprus. However, the Israeli government’s announcement did not go into details, while Israeli officials refused to confirm that Teddy Sagi was the target of the alleged operation.
Iran denies murder plot after alleged assassin caught with gun and silencer in Cyprus | intelNews.org