Leaders of Russia and the United States will sign a new nuclear disarmament treaty in Prague on Thursday. Under the treaty, the deployed warheads held by the two super nuclear powers will be reduced to 1,550, about 30 percent lower than a previous nuclear disarmament treaty's limitation.

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?[Zhang Liyun/Xinhua]

Can we believe the implementation of the new treaty will fundamentally change the role of nuclear weapons in both countries' security strategies? Would it set a positive tone for the Nuclear Security Summit held earlier next week?

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? U.S., Russia cut nukes by 30%

? US, Russia 'very close' to START

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