Changes to U.S. missile shield plans in Europe address only some of Russia's concerns.
PAUL J. RICHARDS/AFP/Getty Images
U.S. Defense Secretary Chuck Hagel speaks at the Pentagon on March 15
Concerns about immigration are delaying discussion of the countries' admittance to the Schengen zone.
Both countries use demands for more autonomy by ethnic Hungarians in Romania as a political issue.
To achieve its foreign policy objectives, Bucharest must first settle its governmental affairs.
One of the pillars the European Union was built upon is coming under threat.
Running out of time for its pipeline to Europe, Moscow will need to offer concessions to Sofia.
The country will rely on foreign workers to offset the effects of population decline.
Eurozone integration efforts have been met with different responses from Hungary, Romania and Bulgaria.
A Russian spokesman suggested the breakaway region could join Moldova, but significant constraints remain.
