My assessment is that Harris will be slightly better than Biden for Ukraine, while Trump will be substantially worse. And one big reason is that the Trump campaign is being indirectly bankrolled and assisted by Russian money and propaganda, and to a lesser extent by the Chinese as well.
Trump is loyal to one thing, and that is cold hard currency. He’ll never quite be Putin’s lapdog, but he’ll be tame enough as long as the money spigot keeps flowing. And that’ll mean bad things for Ukraine.