Before signing START, Moscow and Washington had more than 10,000 nuclear warheads Putin proposes to extend agreement for 1 year, Trump insists on drafting new treaty that includes China MOSCOW The New Strategic Arms Reduction Treaty (New START) – the last remaining, legally binding agreement limiting US and Russian strategic nuclear forces – is set to expire this week, raising fears of a new era of unregulated nuclear competition. The treaty builds on the first START, which became one of the