PARIS, March 30 - America's top general in Europe has been sent back early from a trip to Washington in what the Pentagon on Sunday called a prudent step given Russia's "lack of transparency" about troop movements across the border with Ukraine, Reuters reported.

General Philip Breedlove, who is both NATO's Supreme Allied Commander Europe and the head of the U.S. military's European Command, arrived in Europe Saturday evening. He had been due to testify before Congress this week.