
President Vladimir Putin has said Russia will put more than 40 new intercontinental ballistic missiles into service this year.
It is part of a wide-reaching programme to modernise the country's military.
The move comes after the US proposed increasing its military presence in Nato states in Eastern Europe.
Nato has condemned the Russian announcement, saying the move amounted to "nuclear sabre-rattling" and was "unjustified" and "dangerous".
Tensions are high over Russia's role in the conflict in eastern Ukraine.
Speaking at an arms fair, Mr Putin said the weapons would be able to overcome even the most technically advanced anti-missile defence systems.

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