'Russia must improve its nuclear shield'

Russia's nuclear shield should be strengthened in coming years due to the "colossal threats" facing the world's biggest nuclear power, the head of Russia's state nuclear corporation Alexei Likhachev said on Thursday.

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Russia and the US are upgrading their nuclear arsenals—including the systems used to detect and intercept incoming nuclear-armed missiles—just as China ramps up its own nuclear capability far beyond those of Britain and France.