Trust, but verify Trust, but verify Trust, but verify (; "Doveryat, no proverit") is a Russian proverb. The phrase became well known in English when used by President Ronald Reagan on multiple occasions in the context of nuclear disarmament. Suzanne Massie, an American writer, met with President Ronald Reagan many times between 1984 and 1987. She taught him the Russian proverb "Doveryai, no proveryai" (; "Trust, but verify"), advising him that "The Russians like to talk in proverbs. It would be nice of you to know a few. You are an actor – you can learn them very quickly." The proverb was adopted
Effects of the Cold War and other nuclear processes. On the other hand, despite the end of the Cold War, military development and spending has continued, particularly in the deployment of nuclear-armed ballistic missiles and defensive systems. Because there was no formalized treaty ending the Cold War, the former superpowers have continued to various degrees to maintain and even improve or modify existing nuclear weapons and delivery systems. Moreover, other nations not previously acknowledged as nuclear-weapons states have developed and tested nuclear-explosive devices. The risk of nuclear and radiological terrorism by possible sub-national organizations or individuals is now a concern. The international nonproliferation regime inherited