For centuries, Latvia's eastern frontier has repelled invaders not through force alone but through the quiet resistance of land and water. Today, that ancient geographical logic has been joined by a new kind of deterrence — anti-ship missiles, layered air defenses, and the hard lessons of Ukraine — transforming a small Baltic nation into a far more formidable proposition than its size might suggest. The question of whether Latvia can be invaded from the east is, in the assessment of those who study it closely, less a matter of political will than of physical and technological possibility.