WASHINGTON (Reuters) - Russia properly notified the United States ahead of its test launch of an intercontinental ballistic missile, the Pentagon said on Wednesday, adding it saw the test as routine and not a threat to the United States.

       Russia said earlier on Wednesday it had conducted a first test launch of its Sarmat intercontinental ballistic missile, a new addition to its nuclear arsenal which President Vladimir Putin said would give Moscow's enemies something to think about.

       (Reporting by Phil Stewart and Susan Heavey)