On the first day of high-level discussion at the United Nations General Assembly, leaders of Brazil and the United States were among the first to address the gathering, underscoring underlying tensions about COVID-19 measures but also drawing needed attention to vaccine gaps.World leaders weigh in COVID measuresBrazil President Jair Bolsonaro, the first to speak, touched on the pandemic in his speech, but other elements of his presence drew attention to his defiance over tough COVID-19 measures, according to the Washington Post.Bolsonaro reportedly isn't fully vaccinated, and United Nations rules specify that those in the General Assembly hall must be vaccinated under an "honor system." Brazil's leader has said he doesn't need to be