Mainly security of its borders, security from terrorism, influx of migrants etc.
partly YES. Not only economic crisis in Bulgaria, but also economic crisis inside EU (Greece, Portugal, Ireland etc). Political agenda is much more important. Some major players in the EU is not keen for BG and RO to enter Schengen and Eurozone very soon. However its almost unavoidable to refuse Bulgaria to enter Schengen in 1912
Yes, with Schengen visa you can enter in Croatia.
Turkey is not part of the Schengen Area. Schengen visas are not valid.
Yes, Greece is a member of the Schengen Agreement and Schengen visas are valid.
Yes, Spain is part of the Schengen Area.
Yes,Both Switzerland and Germany are members of the Schengen Area. A tourist visa for one Schengen country is valid for all Schengen countries.
Yes, provided that you enter Italy as your first Schengen country, and then travel to France without leaving the Schengen Area. If you need a Schengen Visa it applies for all Schengen countries, this means that you can then travel freely within the Schengen area as long as your visa remains valid.
YesOnce you are legally in the Schengen Area, you can freely travel to any other Schengen country.
No, Russia is not part of the Schengen Area. Schengen visas are not valid.
Yes, as both countries are a part of the Schengen Area.
Not yet... But soon :)
Usually you have to enter the country that issued your Schengen visa first, then you can travel to any other Schengen country. Check with your local German embassy.