CNN —The US has sensitive nuclear technology at a nuclear power plant inside Ukraine and is warning Russia not to touch it, according to a letter the US Department of Energy sent to Russia’s state-owned nuclear energy firm Rosatom last month. The Energy Department warned Rosatom in the letter that it is “unlawful” for any Russian citizens or entities to handle the US technology. The Energy Department’s National Nuclear Security Administration told CNN in a statement that the letter is authentic. “The Department of Energy’s National Nuclear Security Administration can confirm that the letter is legitimate,” said Shayela Hassan, the deputy director of public affairs for the National Nuclear Security Administration. She added: “The Secretary of Energy has the statutory responsibility for authorizing the transfer of unclassified civilian nuclear technology and assistance to foreign atomic energy activities.

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