Country codes for joint venture companies

Not sure whether it's still obligatory, but almost every company on IMDb has a two-letter ISO country code attached. 

I do wonder purely theoretically what one should do if country is explicitly a joint venture? It is an existing type of company, splitting the ownership between two countries and while not yet common in Ukraine's film industry, it is seemingly very possible for a film company to have such type.  I mean, theoretically, there is a country of registration, but it being a joint venture it will inevitably be registered in both countries and a subject to taxes in both of them, too. 

I kinda hoped The Cannon Group, Cannon Films and Golan-Globus Productions would shed some light, since I was under impression that it was Israeli-American joint venture, but apparently it was an American company registered under ownership of Israeli nationals, which is, of course, not the same.