Think of what the world would be like if Russia, the United States, China, India and Pakistan were testing nuclear weapons. They are not because of the Comprehensive Test Ban Treaty (CTBT) which is responsible for shutting down nuclear testing by major and regional powers for more than two decades. (Trump also announced withdrawal from the Intermediate-range Nuclear Forces Treaty, but in this case, evidence of Russian noncompliance is compelling.) By "unsigning" the CTBT, Trump would tell the world that the United States is no longer bound to respect the Treaty's obligation not to test nuclear weapons. Very intrusive inspections -- the kind permitted by the Comprehensive Test Ban Treaty -- might help, but the Senate hasn't consented to the Treaty.

Source: Forbes June 03, 2019 15:00 UTC