British Prime Minister Boris Johnson has spoken with Ukrainian President Volodymyr Zelensky about the “gravely concerning situation” at the Zaporizhzhia nuclear power plant, he said in a tweet Friday.

“Russia must immediately cease its attack on the power station and allow unfettered access for emergency services to the plant," Johnson said.

Johnson's office released a statement after the two leaders' call, saying the United Kingdom "would do everything it could to ensure the situation did not deteriorate further."

Emergency UN meeting: The statement added that Johnson will seek an emergency United Nations Security Council meeting in the coming hours, where the UK plans to raise this issue with Russia and its partners.

CNN