Power has been completely cut off at the Chernobyl nuclear power plant, the site of the world¡¯s worst nuclear disaster in 1986, Ukraine¡¯s energy operator Ukrenergo said on Wednesday, but monitoring groups and experts saw little risk of a major incident.

Russian forces took control of the site after they invaded Ukraine on Feb. 24.

In a statement, the International Atomic Energy Agency (IAEA) said it saw no ¡°critical impact on essential safety functions¡± at the site but said that the development violated a key pillar meant to ensure safety at nuclear power plants.