Here's a theory.
Ukraine's electricity import grew in the past months (back in spring they still exported), have to buy it from neighbouring countries: Poland, Slovakia, Hungary, and Romania (perhaps Moldova too). Recently they cut oil supply to (Czechia,) Hungary, and Slovakia, but who declared they might have to cut the electricity to reciprocate.
What if Ukraine planned stopping buying electricity to cut expenditure but instead acknowledging their financial weakness they put a twist on it and said
> well let's make a strike on these countries first the screenplay says they are dealing with the enemy and they are bad
So now, if electricity sales are cut, they can say it's not for their inability to play, but for the spitefulness of these countries.