Ukraine has had 5 democratically elected presidents since 2000: Kuchma, Yuschenko, Yanukovich, Poroshenko, Zelensky. Each with differing platforms and ideas. For the past 25 years, Russia has had two, and that's if we're counting Medvedev as an independent president rather than Putin's placeholder. The comparison is absurd, and you well know that, but instead prefer to position yourself as Russia's cheerleader.
Ukraine is in martial law, has a significant portion of its population and land under occupation, is under existential threat, would need to dedicate significant resources to organizing an election (approximately $200 million), and would place the lives of its citizens at risk if they were to congregate in large numbers at voting places across the country. Ukraine's constitution provides that elections cannot be held in such a case, and this part has been in Ukraine's Constitution from before the war.
What is past is the past, Ukraine's democracy doesn't survive war, Russia's one does. Ukraine uses its martial law to not only roll back on freedom and democracy but also to roll back on human rights, men (and women) are dragged on the street in broad daylighs.
The Western occupation army in Afghanistan insisted that the Afghan government move on with elections even though there's always the threat of Taliban bombings in polls, why can't they do the same in Ukraine ?