Russia and the United States signed on Thursday...

The document, signed by presidents Dmitry Medvedev and Barack Obama, is expected to bring Moscow and Washington to a new level of cooperation in the areas of nuclear disarmament and arms control.

The new strategic arms pact stipulates that the number of nuclear warheads is to be reduced to 1,550 on each side over seven years, while the number of delivery vehicles in operation and in reserve must not exceed 800.

According to a White House press release, "warheads on deployed ICBMs and deployed SLBMs count toward this limit and each deployed heavy bomber equipped for nuclear armaments counts as one warhead toward this limit."

The document, which will be valid for 10 years unless superseded by another agreement, stipulates that each side has the right to unilaterally withdraw from the treaty if it decides that any of the provisions of the treaty could lead to an imminent threat to its national security.

In a nod to Moscow"s concerns about the Obama administration"s

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