BY A STAFF REPORTER: The head of the International Atomic Energy Agency on Monday visited the South Ukraine Nuclear Power Plant to mark the permanent presence of the nuclear watchdog at the site. The head of the agency is in Ukraine this week to "establish a continuous presence of nuclear safety and security experts at all the country’s nuclear power facilities," the IAEA previously announced. “Now we are setting this permanent presence here,” Rafael Mariano Grossi said in a video posted to his Twitter account. “I think it is highly symbolic that we start this cold evening here, but with a warm spirit and with great determination.”