The annexation of Zaporizhzhia and three other regions has been widely condemned by the international community as "a sham", and the vast majority of governments have described it as against international law.
The confrontation over the status of the plant, and shelling that has damaged some installations there, has led the International Atomic Energy Agency (IAEA) to intervene.
Just as Putin was signing the decree, the Ukrainian state nuclear operator, Energoatom, said its president would assume the duties of the plant's director general.
Petro Kotin, Energoatom president, said in a video address to the employees of the plant: "In accordance with the current legislation, approval and regulatory documents, I have decided to take up the duties of the director general of the Zaporizhzhia Nuclear Power Plant."
He said the administration of the plant would be transferred directly to Kyiv following the detention by Russian officials of the plant's general director, Ihor Murashov. The official also noted that operational issues at the plant would be resolved by the technical staff by agreement with the central office of the company.
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