As reported by Censor.NET citing 112, this was announced by SBU Head Vasyl Hrytsak.
"There has been no special operation that SBU was involved in. She (Savchenko - ed.) did not agree this visit with any governmental body, including the leadership of the SBU. In addition, I cannot approve of her visit to those areas. If anyone of our fighters went there -- from Alfa (secret forces unit - ed.) or volunteer battalions -- they would have been cut into pieces.
"I can't believe this happened without Moscow curators' blessing," Hrytsak said.
On Feb. 24, a video of Savchenko visiting Ukrainian POWs held in the Donbas was uploaded on YouTube.
Earlier, "DPR" militants said that MP Nadiia Savchenko and Volodymyr Ruban, the head of Officers Corps NGO engaged in the hostage liberation process, arrived in the occupied part of the Donetsk region to "visit Ukrainian POWs."
Related materials: Occupied territories - Crimea and Donbas