The noun form is encirclement.
Primarily Germany's naval challenge to Britain from 1900, leading to the Triple Entente of Britain, France & Russia.
They feared Germany had the technology to build nuclear bombs
Encirclement
Fifth Encirclement Campaign against Jiangxi Soviet happened in 1934.
Encirclement Campaign against Northeastern Jiangxi Soviet happened in 1931.
germany gained a feared status among world powers
First Encirclement Campaign against Jiangxi Soviet happened in 1930-11.
Third Encirclement Campaign against Honghu Soviet happened in 1931-09.
First Encirclement Campaign against Honghu Soviet happened in 1930-12.
In Hitler's speech on June 11 1941, he said the Soviet Union was provoking Germany because it was run by Bolsheviks and Jews and part of the British 'encirclement' of Germany.
War on Two Fronts