Ukraine's nuclear power provider accused Russia on Saturday of “kidnapping” the head of Europe's largest nuclear power plant, a facility now occupied by Russian troops and located in a region of Ukraine that Russian President Vladimir Putin has moved to annex illegally.

Russian forces seized the director-general of the Zaporizhzhia Nuclear Power Plant, Ihor Murashov, around 4 pm on Friday, Ukrainian state nuclear company Energoatom said. That was just hours after Putin, in a sharp escalation of his war, signed treaties to absorb Moscow-controlled Ukrainian territory into Russia. Energoatom said Russian troops stopped Murashov’s car, blindfolded him and then took him to an undisclosed location.