Russia is reviewing whether or not it was legal for the Soviet Union to recognize the independence of the Baltic states nearly 25 years ago.

A source "familiar with the situation" said Tuesday the Russian Prosecutor General's office is checking the legality of the Soviet Union's 1991 decision to cede back the states of Lithuania, Latvia and Estonia, according to a report by Interfax.

Two parliamentary deputies, members of the United Russia party loyal to President Vladimir Putin, launched the investigation.

Russia's review outraged her Baltic neighbors, who are already fearful of the growing threat of a highly militarized Russia after it sent troops into the Ukraine and annexed Crimea.

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