History shows that when a state is intent upon making war against another state, even though not adjacent, it begins to seek frontiers across which it could reach the frontiers of the state which it desires to attack. Usually, the aggressive state finds that frontier.
Joseph Stalin[State] finds [frontier] either with the aid of force, as in 1914, when Germany invaded Belgium in order to deal a blow against France or it "borrows" a frontier, such as Germany did with regard to Latvia, for instance, in 1918, in attempting to break through to Leningrad across Latvia.
Joseph Stalin