Use the Military - all of it and don't go off half cocked. I have added a quote from Winston Churchill's "History of the Second World War" Vol 1 where he is explaining the British Government's part in events leading up to the War. Written in 1948, perhaps it still rings true today?
“We must regard as deeply blameworthy before history the conduct of not only the British National and mainly Conservative Government, but of the Labour Socialist and Liberal parties, both in and out of office, during this fateful period.Delight in smooth-sounding platitudes, refusal to accept unpleasant facts, desire for popularity and electoral success irrespective of the vital interests of the State, genuine love of peace and pathetic belief that love can be its sole foundation, obvious lack of intellectual vigour in both leaders of the British Coalition Government, marked ignorance of Europe and aversion from its problems in Mr Baldwin, the strong and violent pacifism which at this time dominated the Labour-Socialist Party, the utter devotion of the Liberals to sentiment apart from reality, the failure and worse than failure of Mr Lloyd-George, the erstwhile great war leader, to address himself to the continuity of his work, the whole supported by overwhelming majorities in both Houses of Parliament: all these constituted a picture of British fatuity and fecklessness which, though devoid of guile, was not devoid of guilt, and, though free from wickedness and evil design, played a definite part in unleashing upon the world of horrors and miseries which, even so far as they have unfolded, are already beyond comparison in Human existence.”