I only remember fragments of this comic, of which I think I only read a single issue in the mid-80s when I was around 12-14 years old. I read it in Sweden and it was translated into Swedish.
The main character, who I am reasonably sure went by the name of Rodion was fighting monsters on some sort of artificial body which nevertheless had some sort of wilderness on it. Along with him was a woman whose name I don't remember. As I remember it, they fought together and were attacked by some sort of vaguely insectoid aircraft (plural).
The style was reasonably realistic, in color and with a sort of French comic artist's look to it (not Mœbius though).
I keep getting occasional flashbacks of this comic and want to know what it is, so I can find it and read it again!
Edit: Looks like it could be the "La vallée des géants" episode of "Les Robinsons de la Terre", where the name Rodion does indeed occur, along with the names Tanou, Orloz, and Zorca which are ringing all kinds of bells. I have yet to dig up any art for it, though.
Edit 2: Yup, that's definitely it! Drawn by Alfonso Font: http://www.albator2980.com/bd-les-robinsons-de-la-terre.htm