I cite Western sources solely because I presume most people here don't read Russian. I had to look it up.
My personal hypothesis about the dam is that it was negligence and perhaps a misguided attempt to "partially demolish it". The main piece of evidence against Ukrainian/Western action is the resolution of Russian Government "On the specifics of application in the territories of the Donetsk People's Republic, Luhansk People's Republic, Zaporizhzhia region and Kherson region of the provisions of the legislation of the Russian Federation in the field of industrial safety of hazardous production facilities and safety of hydraulic structures", issued a week prior to the catastrophe[1], that says among many other similar things:
> d) technical investigation of the causes of accidents at hazardous production facilities and accidents at hydraulic structures shall be carried out by commissions headed by representatives of the authorized bodies.
> a) The provisions of Part Six of Article 10 of the Federal Law "On Safety of Hydraulic Structures" shall not apply until 1 September, 2023;
> 8. Until March 1, 2024 the information on hydraulic structures, located in the territories of the Donetsk People's Republic, Lugansk People's Republic, Zaporozhye Region and Kherson Region and put into operation until June 1, 2023, may be submitted for their inclusion in the Russian register of hydraulic structures without submission of the declaration of safety of hydraulic structures.
> *10. Until January 1, 2028 the technical investigation of accidents at hazardous production facilities and accidents at hydraulic structures, which occurred as a result of military actions, sabotage and terrorist acts, shall not be carried out.*
I'm way past trying to reason about qui bono. Sometimes it works (Nord Stream), sometimes Russia is just a magical place where stuff happens.
1. https://www.garant.ru/products/ipo/prime/doc/406865902/