Steven Andreasen: Should Ukraine rewrite history and reacquire nuclear weapons? No and no

Twenty years ago in Budapest, Hungary, leaders of the United States, Russia, Britain and Ukraine signed a memorandum on nuclear weapons and Ukrainian security. It committed Ukraine to remove nuclear arms from its territory and join the Nuclear Nonproliferation Treaty as a nonnuclear-weapon state - the last former Soviet republic to make that pledge. In exchange, the other three signatories - still nuclear armed - would respect Ukraine's independence, sovereignty and existing borders and not threaten or use force against the territorial integrity or political independence of Ukraine.