Russian Premier League is in this moment probably the best league from Eastern Europe ,considering what huge investments has been done in Russia...top teams like Zenith Sankt Petersburg,TSKA Moscow,Lokomotiv Moscow,Anzhi was for a short time 2011-2013,no.1 rich club from Russia,Kuban Krasnodar etc,many players having top salaries that even in western Europe just dreaming to have such salaries...
after them ,on top is Ukrainian league also very good (Shakhtar Donetsk-always with his presence in Champions League,Dynamo Kiev,Metallist Kharkov,Dnepr Dnepropetrovsk,Chernomorets Odessa -top teams from this country),then Turkish League (losing some power in East after their 2 years ban in Europe (Fenerbahce and Besiktas,corruption,arranging matches) just Galatasaray Istanbul play and represent Turkey in Champions League...then,probably is the Greek league,but their country being in economic crisis,Olympiakos play in Champions League,the 5th league from East i think is the league from my country,Romania,maybe you heard about Steaua Bucharest (ex-team of Vlad Chiriches) or CFR Cluj,Steaua playing in Champions League this season...so,here is the TOP 5 in Eastern Europe,first domestic leagues, in my opinion:
1)-Russia
2)-Ukraine
3)-Turkey
4) -Greece
5)-Romania