A Soviet buildup as a trigger for naval rearmament

The Soviet Union stood outside the interwar naval treaty system, so a visible heavy-ship programme could trigger escalator clauses and weaken the remaining restraints. Japan had the Russo-Japanese War and disputed territory as immediate reasons to respond, while Germany could cite Soviet construction to support its own buildup. Britain and the United States would then face pressure to accelerate HMS Vanguard and Iowa-class ships while continuing carrier investment. Planners in the late 1930s had to balance weapons already proven at sea against air power whose future reach remained uncertain. Soviet construction could therefore produce a linked arms race across several navies.