If it's an official update from LG, it should retain all the languages that it originally came with. And certainly if it's an LG that's intended for your region or country(Russia?), or an international variant, it will retain Russian.
They probably have Korean language only phones in North Korea, and nowhere else, and definitely wouldn't be an LG or Samsung.
I have seen Android devices that are Chinese language only, but those are only intended to be sold and used in China.