I recently read The Sink which you can find here.
It explained countries "sell" passports (maybe also citizenship) to people with enough money. I believe it is still possible today, with Dominica charging $175,000 for example shown here.
In the book it explains how they certain African countries and other small islands were selling them as an easy way for the country to increase income. It was a smart idea as they did not have any other industries.
America almost completely forced these countries to stop "selling" second passports, and one island in particular actually recalled all passports it had "sold".
Question: Why? I know someone is going to say it is because of terrorism, but surely if someone called John Smith is a wanted terrorist a passport from Ukraine should be no different to a passport from Dominica? There are still countries today offering these passports (although they I must say are less corrupt then some of the African countries).