WARSAW, Poland — U.S. President Joe Biden was to meet with Polish leaders and veterans of the war in Afghanistan on Wednesday, during a visit expected to center on revamped plans for a missile defense system. Biden began his day with a visit to the memorial to the Warsaw Ghetto Uprising in the heart of the Polish capital, to remember the suffering endured by Polish Jews during World War II. Amid a light drizzle, the president shook hands and chatted with members of Poland's small Jewish community before placing a wreath of red, white and blue flowers at the foot...