Russia's envoy to NATO is calling for guarantees from Washington that a revised U.S. missile defense plan won't threaten Moscow.

Dmitry Rogozin says that the prospective U.S. system involving missiles on navy ships could potentially cause Russia concern.

He said Tuesday that Russia wants assurances that the prospective U.S. system would be only aimed to counter short- and medium-range missiles.

President Barack Obama earlier this month dumped a plan for missile defense sites in Poland and the Czech Republic, which Moscow fervently opposed. Obama said that a shield involving a network of sensors and missiles at sea or on land would be deployed instead.

Rogozin demanded guarantees that the planned U.S. missile defenses won't move close to Russia's borders.