After having worked with people from former Eastern Bloc countries, I would nominate a few of them for direct communication, e.g., "I won't do that because it is a stupid idea," or, "Can we discuss this when you know what you're doing?"

Scandinavian are quite different between each others as well.

The Dutch especially. It's refreshing

I'm Greek. I don't know about other Mediterranean cultures, but I assume they're similar.

Scandinavian cultures are not uniform also. Danes can be very direct; Swedes - not so much.