https://www.euronews.com/2023/12/02/russians-support-of-ukraine-war-collapses-finds-poll
The Kremlin is worried about the political impact of war disaffection leading up to the 2024 presidential election, according to a US think tank.
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It is called the "unmatched count technique" or "list experiment." It has a wider error range, so you need to poll more people, but you get honest answers.
Sorry, I read about this technique over a year ago, and I can't seem to formulate the right Google search to re-find it.