On Thursday, experts of the International Atomic Energy Agency (IAEA), the UN’s nuclear watchdog, reached the Zaporizhzhia nuclear power plant in southern Ukraine for what is the riskiest mission of the agency’s history. Shortly before departing for the plant from Kyiv, IAEA Director General Rafael Mariano Grossi told journalists: “We are aware of the current situation. There has been increased military activity, including a few minutes ago. But weighing the pros and cons, and having come so far, we are not stopping.” Wearing a blue bulletproof vest stamped “United Nations,” Grossi added: “We are moving now, accepting the risks are very, very high,” commenting ahead of their trip across the front line.