Demonstrators massed in central Minsk on Sunday after opposition leaders called for a huge rally to demand the resignation of Belarusian President Alexander Lukashenko, the latest in a wave of protests against his disputed re-election. The authoritarian leader dispatched his notorious riot police to disperse spontaneous rallies that erupted after he claimed a sixth presidential term in an election two weeks ago that critics say was rigged. Tens of thousands of demonstrators draped in the red-and-white flags of the opposition flooded Independence Square and marched through the capital chanting “freedom” and “we will not forget, we will not forgive” as passing cars honked in support. “We have just two demands: fair elections and stop the violence,” 32-year-old Igor told AFP. Officials issued...