It is literally just a totally normal synecdoche, it's just metonomy that everyone fucking does. "Beijing" for the Chinese government, "Washington" for the American government, "London" for the British government, "Paris" for the French government. It's totally normal. The fun comes from them immediately going "Moscow is a friendly country". Which even if it is totally normal to use it as synecdoche, means you're still directly referring to Moscow as a country.