The Warsaw Pact was the second world defensive military treaty in cold war terms where it originated. NATO allied countries, Warsaw pact allied countries, and unaffiliated with either.

But word definitions change with usage, and today first and third are more commonly used to identify economic development as a catch all measurement for developed vs undeveloped countries and regions. I don't think it's bigoted, but it is a superficial comparison. I think you can learn a lot more about a culture through their art and treatment of prisoners for example, among other measurements.