奥巴马也可以选择开始向乌克兰提供防御性武器，这是国会近期授予他的权力。

President Obama could also choose to begin supplying Ukraine with defensive weapons, a power recently granted to him by Congress.

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俄罗斯也获得了奥巴马的保证，未来的谈判中将把进攻性和防御性武器系统放在一起考虑。

The Russians received assurance from Mr. Obama that offensive and defensive weapons systems would be considered together as negotiations go forward.

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具体而言，一是可能将军备竞赛引入外空，二是可能将军备竞赛从进攻性武器扩大到防御性武器。

To be specific, it may start off an arms race in outer space, and may also extend the arms race from offensive weapons to defensive weapons.

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