That may be it. It also may be a way of cutting off Libyan oil production through continued mayhem in the country, keeping it off the market, to shore up the price of its own oil. That's more likely. The added kicker is to oppose Turkey to keep it isolated from its neighbors.
To add to your point, in Italy and other Mediterranean economies accustomed to using oil from Libya, Russian oil (and Russian controlled oil from Libya) can easily displace Libyan oil from other vendors. It is worth recalling that Putin’s dissertation for his law degree when the Soviet Union collapsed advocated in detail how the new Russian state should use control over oil resources to rebuild its lost strength and power.