Russian President Dmitry Medvedev has announced plans to build a "guaranteed nuclear deterrent system" to be in place by 2020.
He said he wanted military chiefs to submit plans by December.
He called for a programme to build new nuclear submarines as well as "a system of aerospace defence".
The announcement comes just weeks after Russia accused America of starting a new arms race by siting part of its missile defence shield in Poland.
(BBC)
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