Are all the Countries in Eastern Europe 1st world?

Third world means, developing countries...

Are some countries in eastern Europe classified as developing (Asian and Latin American standards).

Like if you are from the UK, you go to an Eastern European country and the prices are like that of Thailand or Indonesia.

I just realized I know very little or nothing about some countries in Europe.
example: Estonia, Slovenia, Bulgaria and Hungary. Well I know Hungary as in Budaphest and Hungarian sausages. I assume that these places are as expensive as other EU countries. Ooops wait, are they EU member states?

I am not looking for jobs. I just need to be in a European country, coz I want to set foot in all the continents of the world.

I'm thinking, its easier to get a Visa from non EU states, coz that would mean, I only visit one country. I also think that if the country is not so industralized or rich, they won't think people from Asia will go there to look for jobs. And less developed countries will need revenues from tourist, so they won't have too many requirements for travellers.

For developing, you're probably looking at Albania, Macedonia, Ukraine, Romania and Moldova which I'd still call developing, although I've never been I'm just going from what I've heard/read.

According to the Human Development Index (measures life expectancy, standard of living, education and literacy, look it up on Wikipedia) Ukraine is the same as Thailand, Moldova is somewhat lower.
According to GDP per capita, Bosnia and Herzegovina, Ukraine, Albania are below Thailand. Moldova is the only one below both Thailand and Indonesia. I must admit I don't really know anything about Moldova though!
Wikipedia is great for researching these types of statistics as well as general info about the countries.

Hungary and Slovenia are somewhat popular amongst travellers, I don't know much about the other 2 you listed either but I think they are still semi-developed.

Thanks

wow, I wish I meet people from those places.