Hilary Swift—The New York Times/Redux One measure of a diplomat is whether, even when world governance falls out of favor, states still open their doors to you. After Russian troops overran the Zaporizhzhia atomic plant in Ukraine, both sides cleared the way for an inspection team headed by Rafael Mariano Grossi, chief of the U.N.’s International Atomic Energy Agency (IAEA), to assess the damage and help keep the core cooled.