US vice president Joe Biden says Washington should seek an "adaptive missile defense shield" and conventional warheads with global range.
Biden, who spoke at the National Defense University on Thursday, added that development of programs such as the planned anti-missile in Europe would allow the United States to decrease its nuclear weaponry.
"Capabilities like an adaptive missile defensive shield, conventional warheads with world-wide reach and others that are developing and being developed will enable us to reduce the role of nuclear weapons as other nuclear powers begin to draw down even further," the vice president said.
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