Barring last-minute nuclear deal, US and Russia teeter on brink of new arms race with 'New START treaty'

The United States and Russia stand on the brink of a nuclear arms race. Their final arms control treaty expires soon. Without a deal, long-range nuclear arsenals will be unconstrained for the first time since the Cold War. Russia proposes a one-year extension. The US response is pending. China's expanding nuclear capabilities add another layer of concern.