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  5. The greatest threat to U.S. and global security is no...

The greatest threat to U.S. and global security is no longer a nuclear exchange between nations, but nuclear terrorism by violent extremists and nuclear proliferation to an increasing number of states.

Barack Obama
Nuclear Terrorism, Numbers, Nuclear Proliferation
"U.S. announces new restrictions on nuclear weapon use", www.cnn.com. April 7, 2010.
The greatest threat to U.S. and global security is no longer a nuclear exchange between nations, but nuclear terrorism by violent extremists and nuclear proliferation to an increasing number of states.