‘New START’ treaty expires, ending limits on US–Russia nuclear arms

The last remaining nuclear arms control agreement between the United States and Russia—the New Strategic Arms Reduction Treaty (New START), expired on Thursday, removing the final limits on the world’s two largest nuclear arsenals.
Signed in 2010, New START capped the number of deployed strategic nuclear warheads and delivery systems held by Washington and Moscow. Its expiration marks the first time in more than 50 years that no formal restraints exist on US and Russian nuclear forces.