MOSCOW - The United States said on Wednesday it was fully committed to completing an antimissile shield in Europe even as Moscow promised to use computer modelling to show an international conference how the NATO system threatens its security.

A dispute over the system has slowed improvements in Russian-US ties and is likely to remain an irritant after Vladimir Putin returns to the Kremlin next week for a six-year presidential term.

Washington says the shield, due to be completed in four phases by roughly 2020, is meant to counter a potential threat from Iran. Moscow says the system will undermine Russia's nuclear deterrent because it could also give the West the ability to shoot down Russian missiles.

The shield's first phase is to be declared up and running at a NATO summit this month in Chicago.

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