Washington has raised "the possibility of... A violation," State Department spokeswoman Jen Psaki said, amid reports that Russia had tested a new ground-launched cruise missile.
The New York Times said today that Moscow had begun testing the new missile as early as 2008, and that the State Department's senior arms control official Rose Gottemoeller had repeatedly raised the issue with Moscow since May.
Psaki said she could not refute the details of the Times report, and there was an ongoing interagency review to determine whether the Russians had violated the terms of a US-Russian arms control pact.
"The important note here is that there's still an ongoing review, an interagency review determining if there was a violation," Psaki stressed, adding the consultations had been continuing for some months.
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A NATO official said "this is a serious matter" adding that the treaty was "a key component of Euro-Atlantic security."