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 The United States is intended to complete an anti-ballistic missile shield “whether Russia likes it or not,” Reuters quotes the U.S. envoy to NATO Ivo Daalder as saying on Friday.

The U.S. estimate of the Iranian ballistic missile threat has gone up, not down, over the two years since President Barack Obama opted for a new, four-phased deployment to protect the United States and NATO allies, Daalder said.

"It's accelerating," Daalder said of the U.S.-perceived threat of Iran's ballistic missiles, "and becoming more severe than even we thought two years ago."

"We're deploying all four phases, in order to deal with that threat, whetherRussia likes it or not," he added. At the same time, he urged Moscow to cooperate in both to deal with Iran and to see for itself that, as he put it, the system's capabilities pose its strategic deterrent force no threat.

If the perceived threat from Iran ebbs, "then maybe the system will be adapted to that lesser threat," Daalder said.