The United Nations’ nuclear watchdog has called for a no-fire zone around an embattled Ukrainian nuclear generator, but — like the plant itself — the agency was quickly caught up in the war between Russia and Ukraine.

In a highly anticipated report released Tuesday, nuclear inspectors who had to wend their way through the battlefield to reach the plant said they were "gravely concerned” about conditions there.

"We are playing with fire, and something very very catastrophic could take place,” said Rafael Mariano Grossi, the U.N. official who led the inspectors, in an address to the Security Council on Tuesday afternoon.