First of all, unmanned aircraft typically lack defensive weapons with which to protect themselves.

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Russia's hold on us is the Anti-Ballistic Missile (ABM) treaty, which essentially prohibits building defensive weapons.

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Continued development and deployment of strategic offensive and defensive weapons, particularly naval, ballistic, space and cyber forces.

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In November, France called for defensive weapons to be provided to the opposition, but Paris's support for a broad change to the arms embargo has faded recently.

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Xolair is a biological compound, called a monoclonal antibody, that attaches itself to immunoglobin E, one of the body's defensive weapons that goes into overdrive in allergy patients.

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The Bush Administration is willing to think about moving from strategic arms agreements that limit offensive weapons and ban defensive ones to a new set of mix-and-match totals where offensive and defensive capabilities are somehow reckoned together.

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Furthermore, no country, including the United States, has ever given up territory and needed defensive space just because it had advanced weapons systems or sophisticated early warning technology.

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Even in Skyrim, which does actually utilize shields as a valid defensive mechanism, shields tend to be less valuable than simply equipping stronger weapons.

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