what countries can you not camp in the wild in eastern europe?

planning on backpacking around eastern europe and want to camp as much as possible basically to rough it and save some money to make the trip last longer wondered what countries you couldnt camp in

U can find places to camp in everywhere in Eastern Europe.

Please define Eastern Europe.

There are a lot of camps available all over Europe (also in major cities), but it's mostly illegal to camp outside of designated areas. Especially in natural parks.
Keep also in mind that if you camp somewhere, that place has an owner any you may be trespassing.

Go around the Balkans - go to Bulgaria, Romania, Serbia, Macedonia, etc
There are plenty of places to camp, you can take trains which are dirt cheap and there are also plenty of hostels and cheap housing around each country. You do need a plan of action and a route though - don't just go without any idea:)