A TEENAGER ATTACKED the bust of Josef Stalin that marks his grave on Red Square, knocking off its nose to show his hatred of the dictator, a newspaper reported Friday. . . . BRAZILIAN PRESIDENT Fernando Collor de Mello escaped an assassination attempt unharmed Friday when a man with a knife tried to attack him during a ceremony at the entrance of the Government Palace. . . . THE DALAI LAMA, Tibet's exiled spiritual leader, said Friday that he was drafting a constitution that would cut his homeland's ties with China.