Frosty Russia-US ties will mar post-Obama cooperation

Russian activity abroad has formed a contentious policy issue in the US presidential election

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Next US president will confront nuclear disorder

Obama's efforts to promote nuclear restraint are running afoul of North Korean tests, Russian ambiguity and US politics

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North Korea has carried out its most powerful nuclear test to date

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With less than six months left in office, President Barack Obama is considering changes in US nuclear weapons policy

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South Korea has agreed to host an advanced US missile defence battery

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Obama seeks to secure key achievements before departing office and hand his successor a strong international position

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Pakistan's bid for membership has opened up a diplomatic rift in a key nuclear non-proliferation institution

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North Korea this month held its first Party Congress in three decades

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China has made progress in developing its nuclear weapons capabilities and has hinted at major changes in policy

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The final Nuclear Security Summit has ended, but the risks of nuclear terrorism, arms races and proliferation persist

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