The U.S. Naval Institute’s website examines the defense complexities of an outbreak of hostilities in the Baltic Sea region. Nations most involved include Finland, Sweden, Denmark, Russia (including Kaliningrad), plus the so-called Baltic Republics: Estonia, Latvia, and Lithuania. Norway, Germany and Poland also have skin in the game.
Given the various memberships in the EU and NATO and associated memoranda of understanding, the region’s defense against a possible Russian attack becomes a many-branched decision tree. This article is for the true enthusiast, or someone with roots in the region, it’s not precisely a casual read. Hat tip to RealClearDefense for the link.