Barack Obama and Dmitry Medvedev yesterday signed an arms control treaty the White House hails as a big step forward for its bid to reset relations with Russia, as well as for Mr Obama's broader nuclear agenda.
But prospects for ratification are uncertain for the new strategic arms reduction treaty, which cuts the number of long-range nuclear weapons each country can deploy by almost a third.
Although the Start treaty is Mr Obama's biggest foreign policy success to date, its impact on the wider US goal of convincing other countries to accept nuclear restrictions is unknown.
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