"NATO’s Baltic members are accustomed to regular harassment by Moscow, with aggressive espionage, subversion, and manipulation of local politics, business, and Russian minorities being part of daily life in Estonia, Latvia, and Lithuania. Russian intelligence services are highly active in the Baltics and generally treat them as less than sovereign states, much less NATO member countries. "

http://nationalinterest.org/commentary/poland-nato-the-return-history-9336?page=show