MOSCOW (Reuters) -The United States has told its citizens to leave Russia immediately due to the war in Ukraine and the risk of arbitrary arrest or harassment by Russian law enforcement agencies. "U.S. citizens residing or travelling in Russia should depart immediately," the U.S. embassy in Moscow said. "Do not travel to Russia," it added.

The object went down in the lake Sunday and there were no indications of any collateral damage, a congressional source briefed on the matter and two U.S. officials told NBC News.