(Bloomberg) -- The U.S. military is beefing up cyber defenses to counter threats by hackers trying to gain access to nuclear missiles and other weapons.

Amid growing concerns about cyber attacks from Russia, China and groups such as Islamic State, the U.S. is seeking $34.7 billion through 2021 to boost cyber-security capabilities. Meanwhile, the U.K. has set aside 1.9 billion pounds ($2.7 billion) from its military budget for spending on cyber security over the next five years, on top of 860 million pounds spent since 2011, according to the U.K.’s Ministry of Defence.

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