Estonia, Lithuania, and Latvia are building massive new fortifications along their borders with both Russia and Belarus in order to create a common defense line against possible future invasions by Moscow or its allies in Minsk. The Baltic Defense Line as the project has come to be known was an important piece of a new agreement struck between the three nations aimed at reinforcing NATO’s borders with Russia, and the defense will only get tougher. Latvian Defense Minister Andris Sprūds noted in a statement about the new agreement that he and the defense ministers of Estonia and Lithuania approved the...