The United States declared the results of the president election in Belarus invalid on Monday and called for a new race, even as President Aleksandr G. Lukashenko defiantly swept aside criticism and declared himself the winner of a third term. In an impassioned appearance hours after state television announced that he had won nearly 83 percent of the vote, Mr. Lukashenko exuded confidence and said the outcome had “convincingly demonstrated who the Belarussians are and who is the master of our house.” Full Story