Original sentence: Here he very much favored such “realpolitic” actions as the violation of Danish neutrality, in case of war with Great Britain, by immediately occupying  the Danish archipelago to deny Britain access to the Baltic Sea and Russia
Edited sentence: Here he very much favored such “realpolitik” actions as the violation of Danish neutrality, in case of war with Great Britain, by immediately occupying  the waterways of the Danish archipelago (The Belts) to deny the British navy access to the Baltic Sea and Russia