One country disarming is not going to persuade others, particularly those like China and Russia that still consider themselves great powers, to do so. At the same time the United Kingdom’s situation can never be compared to other countries; Israel would argue it is surrounded by enemies, China that it needs them if the US has them etc. These countries would only consider whether to disarm based upon their own national interests not what other states have done. We should do the same and renew trident as being necessary for the defence of the realm.