The International Atomic Energy Agency (IAEA) said electrical substations "vital for nuclear safety" were affected by the massive Russian strike on Ukraine overnight into Tuesday, leading the Chernobyl nuclear power plant to lose all of its off-site power.

"(Ukraine) needs more missiles, more air defense," Volodymyr Zelensky said, adding that aside from U.S.-produced Patriot PAC-3 missiles used against Russian ballistic missiles — whose numbers have increased significantly — "nothing else works.