Referendum was incorrect. It was just a vote by the legislature, so elected representatives. I had seen Referendum used in some source, but I forget where.

On 26 February 2025, after a previous failed vote on a similar resolution,[27] the Verkhovna Rada passed a resolution reaffirming that elections should not be held during martial law, and also pledged to hold a presidential election upon the conclusion of the Russo-Ukrainian War.[28] On 6 March 2025 opposition politicians Petro Poroshenko and Yulia Tymoshenko, after having confirmed that they had held discussions with United States representatives, confirmed that they still opposed elections held during wartime.[29]

https://en.wikipedia.org/wiki/Next_Ukrainian_presidential_election