Russian destabilization efforts aimed at the Baltic States are most likely to come from the Baltic Sea; be maritime, nonlethal, and nonnaval; and use political, diplomatic, informational, psychological, and economic tools, and perhaps paramilitary forces.
Murphy, Martin and Schaub, Gary Jr.
"“Sea of Peace” or Sea of War—Russian Maritime Hybrid Warfare in the Baltic Sea,"
Naval War College Review: Vol. 71
, Article 9.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol71/iss2/9