Which Eastern European Country Shares Zero of the Same Borders?

Which eastern european country shares zero or none of the same borders with countries that it shared borders with in 19 89, although its physical borders have not moved? That's a complicated one, but you know, that'll be explained later. And then, er, specifically, here sarah's questions for me. So she asked me questions. Now, these questions might seem a bit random, but sarah is a great quiz mistress and there is a link between all the answers to these questions. There is a link which is tailored to me somehow. Can you spot that link, and do you know the answers tothese questions?