You seriously consider parts of Europe to be a 3rd world countries?
These days, first world is synonymous with 'developed', third with 'developing' and second doesn't really have a meaning.
By the definition posted bellow they are all 1st world countries. In what I consider a 3rd world country most citizens don't have access to clean water, "proper" housing, health-care, etc... and $12 is closer to a weekly salary. And I'm pretty sure the lowest standard of living is much worse (and affects higher percentage in population) in India or all of the South America than it is in Ukraine.