WASHINGTON (Reuters) -The United States on Friday imposed sanctions on Russian billionaire Viktor Vekselberg, three family members of President Vladimir Putin’s spokesperson and lawmakers in the latest punishment for Moscow’s invasion of Ukraine. Russia has been hit by a slew of measures since launching its Feb. 24 invasion, the biggest attack on a European state since 1945, which Moscow says is “a special operation” to disarm its neighbor and dislodge leaders it calls “neo-Nazis.” Those hit by Friday’s sanctions include 10 people on the board of VTB Bank, the second-largest lender in Russia, …